[Enhancement] Improve category link support when grouping by tags

[sserrata]

Description

Seeks to improve category link support when using sidebarOptions to group paths by "tags".

Lots of changes:

• Introduces categoryLinkSource to sidebarOptions
• Generates unique filenames and doc ID for intro docs
• Rename intro docs from index.api.mdx to <unique id>.intro.mdx for distinction
• Defaults to generated-index category links when grouping by tags (switches to doc link when useInfoAsCategoryLink is true )
• Defaults to tag description for generated-index description (only when categoryLinkSource is undefined)
• Extends InfoObject to include tags (necessary for associating tags with tagged grouping of paths)

Additional Changes:

• Fix col width for non-API docs
• Stop overriding font-size for h2 tags

Motivation and Context

Previously, when grouping by "tags" intro docs were omitted since, when referencing multiple specs, the index MDX file was being overwritten.

How Has This Been Tested?

Tested locally using Petstore API and CSPM API.

[sserrata]

Related to #95 and #90

[github-actions]

Size Change: +4.07 kB (0%)

Total Size: 2.38 MB

Filename	Size	Change
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demo/build/assets/js/29e917ab.********.js	427 B	+427 B (new file)	🆕
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demo/build/assets/js/4da2255a.********.js	1.8 kB	+1.8 kB (new file)	🆕
demo/build/assets/js/73ed6c6b.********.js	489 B	+489 B (new file)	🆕
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demo/build/assets/js/e05c9529.********.js	1.68 kB	+1.68 kB (new file)	🆕

ℹ️ View Unchanged

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demo/build/assets/js/common.********.js	125 kB	0 B
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[github-actions]

Visit the preview URL for this PR (updated for commit 1248b4e):

https://docusaurus-openapi-36b86--pr97-k0uazgwm.web.app

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[blindaa121]

Looks good to me! 🚀

[sserrata]

🤞🏽