Docs: quick fixes for HTML (#36395)

* Using the new helper in the doc

* Remove input from `Tab` access

* Change scrollspy code examples

* Reordering tables for JS

* Fix for parcel file

* Center align all the code example texts in layout

* Alphabetical reorder the helpers

site/data/sidebar.yml

@@ -102,13 +102,13 @@
     - title: Clearfix
     - title: Color & background
     - title: Colored links
-    - title: Ratio
     - title: Position
+    - title: Ratio
     - title: Stacks
-    - title: Visually hidden
     - title: Stretched link
     - title: Text truncation
     - title: Vertical rule
+    - title: Visually hidden
 
 - title: Utilities
   icon: braces-asterisk