Doc: Updates and Features

Change Summary

This summary includes a series of fixes and CI updates to improve documentation. Full list under proposed changes.

Add Markdownlint to pre-commit CI process (with gitignore to ignore auto docs)
Update a lot of casing from Cloudvision to CloudVision
Update headings to use heading syntax vs emphasis
Bump mkdocs-material from 8.3.9 to 8.5.1
Remove duplicate TOC already generated by GitHub or mkdocs
Enable markdown extensions and features in mkdocs (content.tabs.link, attr_list, emojis)
Disabled fractions within smart symbols (Ethernet¼ will not be Ethernet1/4)
Many updates from CI markdown check (spacing, lists, emphasis, etc)

Reviewers can use either of the following:

install requirements within ansible_collections/arista/cvp/docs/requirements.txt and run mkdocs serve
Head to the readthedocs site based on this PR

[x] My code has been rebased from devel before I start
[x] I have read the CONTRIBUTING document.
[x] My change requires a change to the documentation and documentation have been updated accordingly. (check the box if not applicable)
[x] I have updated molecule CI testing accordingly. (check the box if not applicable)