Add icons info block

Author: bendera

src/components/icons-info.md

@@ -0,0 +1,12 @@
+To use the icons, the codicons.css file must be included in the page:
+
+```html
+<link rel="stylesheet" href="path/to/codicon.css" id="vscode-codicon-stylesheet">
+```
+
+:::caution
+Note the required `id` on the link element!
+To use web fonts in web components, the component needs to include
+the font stylesheet in addition to the page. This id serves as a lookup so
+the icon component can automatically create and insert it's own link tag.
+:::