tutorial: minor fixes + move code and images to a separate dir

tutorials/code/blog/article.v

@@ -0,0 +1,17 @@
+module main
+
+struct Article {
+	id    int
+	title string
+	text  string
+}
+
+pub fn (app &App) find_all_articles() []Article {
+	db := app.db
+	articles := db.select from Article
+	return articles
+}
+
+
+
+

tutorials/code/blog/blog.v

@@ -0,0 +1,48 @@
+module main
+
+import (
+	vweb
+	time
+	pg
+)
+
+struct App {
+mut:
+	vweb vweb.Context
+	db pg.DB
+}
+
+fn main() {
+	app := App{}
+	vweb.run(mut app, 8080)
+}
+
+fn (app mut App) index_text() {
+	app.vweb.text('Hello, world from vweb!')
+}
+
+/*
+fn (app &App) index_html() {
+	message := 'Hello, world from vweb!'
+	$vweb.html()
+}
+*/
+
+fn (app &App) index() {
+	articles := app.find_all_articles()
+	$vweb.html()
+}
+
+pub fn (app mut App) init() {
+	db := pg.connect(pg.Config{
+		host:   '127.0.0.1'
+		dbname: 'blog'
+		user:   'alex'
+	}) or { panic(err) }
+	app.db = db
+}
+
+fn (app mut App) time() {
+	app.vweb.text(time.now().format())
+}
+