docs: everest mount page refresh (#9601)

* docs: mount doc refresh

* docs: revert some of the missing information

* remove refactoring to mount.md

* Improved Everest mount documentation for clarity and organization

* doc review changes

* Apply suggestion from @talSofer

Co-authored-by: talSofer <[email protected]>

* Apply suggestion from @talSofer

Co-authored-by: talSofer <[email protected]>

* level 4 heading not as part of toc

* more docs review changes

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Co-authored-by: talSofer <[email protected]>

Author: nopcoder