net.html: polish module, update docs (#7193)

vlib/net/html/html.v

@@ -0,0 +1,18 @@
+module html
+
+import os
+
+// parse parses and returns the DOM from the given text.
+pub fn parse(text string) DocumentObjectModel {
+	mut parser := Parser{}
+	parser.parse_html(text)
+	return parser.get_dom()
+}
+
+// parse_file parses and returns the DOM from the contents of a file.
+pub fn parse_file(filename string) DocumentObjectModel {
+	content := os.read_file(filename) or { return DocumentObjectModel{
+		root: &Tag{}
+	} }
+	return parse(content)
+}