docs: S2 docs newest testing fixes (#9241)
* add component page descriptions
* fix markdown script links to work for no extension and query/hash
* add relatedPages for Autocomplete and Toast
* support external links in sidenav
* fix broken relatedPages
* clean up url normalization in markdown script
* fix long page titles in OG image script
* shorten descriptions
* improve descriptions
* fix accordion jsdoc
* consolidate SearchMenu and MobileSearchMenu logic
* fix more missing descriptions
* fix typos
* update descriptions to match existing docs
* add descriptions to index page
* remove component names from descriptions
* shorten longer descriptions
* lint
