diff --git a/_ext/svg/arrows/bottom.svg b/_ext/svg/arrows/bottom.svg
new file mode 100644
index 0000000..af4022a
--- /dev/null
+++ b/_ext/svg/arrows/bottom.svg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 512.171 512.171" style="enable-background:new 0 0 512.171 512.171;" xml:space="preserve">
+<g>
+	<g>
+		<path d="M479.046,283.925c-1.664-3.989-5.547-6.592-9.856-6.592H352.305V10.667C352.305,4.779,347.526,0,341.638,0H170.971
+			c-5.888,0-10.667,4.779-10.667,10.667v266.667H42.971c-4.309,0-8.192,2.603-9.856,6.571c-1.643,3.989-0.747,8.576,2.304,11.627
+			l212.8,213.504c2.005,2.005,4.715,3.136,7.552,3.136s5.547-1.131,7.552-3.115l213.419-213.504
+			C479.793,292.501,480.71,287.915,479.046,283.925z"/>
+	</g>
+</g>
+</svg>
diff --git a/_ext/svg/arrows/bottomleft.svg b/_ext/svg/arrows/bottomleft.svg
new file mode 100644
index 0000000..343692d
--- /dev/null
+++ b/_ext/svg/arrows/bottomleft.svg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 426.672 426.672" style="enable-background:new 0 0 426.672 426.672;" xml:space="preserve">
+<g>
+	<g>
+		<path d="M423.553,131.12l-128-128c-4.16-4.16-10.923-4.16-15.083,0L96.001,187.589L18.22,109.787
+			c-3.051-3.051-7.616-3.947-11.627-2.304c-3.989,1.643-6.592,5.547-6.592,9.856v298.667c0,5.888,4.779,10.667,10.667,10.667
+			h298.667c4.309,0,8.213-2.603,9.856-6.592c1.664-3.989,0.747-8.576-2.304-11.627l-77.803-77.781l184.448-184.448
+			C427.713,142.043,427.713,135.301,423.553,131.12z"/>
+	</g>
+</g>
+</svg>
diff --git a/_ext/svg/arrows/bottomright.svg b/_ext/svg/arrows/bottomright.svg
new file mode 100644
index 0000000..8cca929
--- /dev/null
+++ b/_ext/svg/arrows/bottomright.svg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 426.672 426.672" style="enable-background:new 0 0 426.672 426.672;" xml:space="preserve">
+<g>
+	<g>
+		<path d="M420.069,107.483c-3.968-1.643-8.576-0.747-11.627,2.304l-77.781,77.803L146.213,3.12c-4.16-4.16-10.923-4.16-15.083,0
+			l-128,128c-4.16,4.16-4.16,10.923,0,15.083l184.448,184.448l-77.781,77.781c-3.051,3.051-3.968,7.637-2.304,11.627
+			s5.525,6.613,9.835,6.613h298.667c5.888,0,10.667-4.779,10.667-10.667V117.339C426.661,113.029,424.059,109.125,420.069,107.483z"
+			/>
+	</g>
+</g>
+</svg>
diff --git a/_ext/svg/arrows/left.svg b/_ext/svg/arrows/left.svg
new file mode 100644
index 0000000..f7ff47a
--- /dev/null
+++ b/_ext/svg/arrows/left.svg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 512.171 512.171" style="enable-background:new 0 0 512.171 512.171;" xml:space="preserve">
+<g>
+	<g>
+		<path d="M501.504,160.047H234.837V42.714c0-4.309-2.603-8.192-6.592-9.856c-3.989-1.664-8.576-0.747-11.627,2.304L3.115,248.495
+			C1.109,250.501,0,253.21,0,256.047c0,2.837,1.131,5.547,3.115,7.552l213.504,213.419c2.048,2.048,4.779,3.115,7.552,3.115
+			c1.365,0,2.752-0.256,4.075-0.811c3.989-1.664,6.592-5.547,6.592-9.856V352.047h266.667c5.888,0,10.667-4.779,10.667-10.667
+			V170.714C512.171,164.826,507.413,160.047,501.504,160.047z"/>
+	</g>
+</g>
+</svg>
diff --git a/_ext/svg/arrows/middle.svg b/_ext/svg/arrows/middle.svg
new file mode 100644
index 0000000..aa46824
--- /dev/null
+++ b/_ext/svg/arrows/middle.svg
@@ -0,0 +1 @@
+<svg id="Layer_1" enable-background="new 0 0 506.1 506.1" height="512" viewBox="0 0 506.1 506.1" width="512" xmlns="http://www.w3.org/2000/svg"><path d="m489.609 0h-473.118c-9.108 0-16.491 7.383-16.491 16.491v473.118c0 9.107 7.383 16.491 16.491 16.491h473.119c9.107 0 16.49-7.383 16.49-16.491v-473.118c0-9.108-7.383-16.491-16.491-16.491z"/></svg>
\ No newline at end of file
diff --git a/_ext/svg/arrows/right.svg b/_ext/svg/arrows/right.svg
new file mode 100644
index 0000000..3ecd449
--- /dev/null
+++ b/_ext/svg/arrows/right.svg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 512.171 512.171" style="enable-background:new 0 0 512.171 512.171;" xml:space="preserve">
+<g>
+	<g>
+		<path d="M509.035,248.212l-213.504-212.8c-3.051-3.029-7.595-3.904-11.627-2.304c-3.989,1.664-6.571,5.547-6.571,9.856v117.333
+			H10.667C4.779,160.298,0,165.076,0,170.964v170.667c0,5.888,4.779,10.667,10.667,10.667h266.667v116.885
+			c0,4.309,2.603,8.192,6.592,9.856c1.323,0.555,2.709,0.811,4.075,0.811c2.773,0,5.504-1.088,7.552-3.115l213.504-213.419
+			c2.005-2.005,3.115-4.715,3.115-7.552C512.171,252.927,511.04,250.218,509.035,248.212z"/>
+	</g>
+</g>
+</svg>
diff --git a/_ext/svg/arrows/top.svg b/_ext/svg/arrows/top.svg
new file mode 100644
index 0000000..1d44872
--- /dev/null
+++ b/_ext/svg/arrows/top.svg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 512.171 512.171" style="enable-background:new 0 0 512.171 512.171;" xml:space="preserve">
+<g>
+	<g>
+		<path d="M476.723,216.64L263.305,3.115C261.299,1.109,258.59,0,255.753,0c-2.837,0-5.547,1.131-7.552,3.136L35.422,216.64
+			c-3.051,3.051-3.947,7.637-2.304,11.627c1.664,3.989,5.547,6.571,9.856,6.571h117.333v266.667c0,5.888,4.779,10.667,10.667,10.667
+			h170.667c5.888,0,10.667-4.779,10.667-10.667V234.837h116.885c4.309,0,8.192-2.603,9.856-6.592
+			C480.713,224.256,479.774,219.691,476.723,216.64z"/>
+	</g>
+</g>
+</svg>
diff --git a/_ext/svg/arrows/topleft.svg b/_ext/svg/arrows/topleft.svg
new file mode 100644
index 0000000..9ee7f10
--- /dev/null
+++ b/_ext/svg/arrows/topleft.svg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 426.672 426.672" style="enable-background:new 0 0 426.672 426.672;" xml:space="preserve" transform = "scale(1, -1)">
+<g>
+	<g>
+		<path d="M423.553,131.12l-128-128c-4.16-4.16-10.923-4.16-15.083,0L96.001,187.589L18.22,109.787
+			c-3.051-3.051-7.616-3.947-11.627-2.304c-3.989,1.643-6.592,5.547-6.592,9.856v298.667c0,5.888,4.779,10.667,10.667,10.667
+			h298.667c4.309,0,8.213-2.603,9.856-6.592c1.664-3.989,0.747-8.576-2.304-11.627l-77.803-77.781l184.448-184.448
+			C427.713,142.043,427.713,135.301,423.553,131.12z"/>
+	</g>
+</g>
+</svg>
diff --git a/_ext/svg/arrows/topright.svg b/_ext/svg/arrows/topright.svg
new file mode 100644
index 0000000..a845a01
--- /dev/null
+++ b/_ext/svg/arrows/topright.svg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 426.672 426.672" style="enable-background:new 0 0 426.672 426.672;" xml:space="preserve" transform = "scale(1, -1)">
+<g>
+	<g>
+		<path d="M420.069,107.483c-3.968-1.643-8.576-0.747-11.627,2.304l-77.781,77.803L146.213,3.12c-4.16-4.16-10.923-4.16-15.083,0
+			l-128,128c-4.16,4.16-4.16,10.923,0,15.083l184.448,184.448l-77.781,77.781c-3.051,3.051-3.968,7.637-2.304,11.627
+			s5.525,6.613,9.835,6.613h298.667c5.888,0,10.667-4.779,10.667-10.667V117.339C426.661,113.029,424.059,109.125,420.069,107.483z"
+			/>
+	</g>
+</g>
+</svg>