[Experimental]: Frontload docs support

[sserrata]

Description

Attempt to add support for front loading MD/MDX docs before API docs. It is intended to work as follows:

• Define beforeApiDocs plugin option as array of relative paths to MD/MDX docs to frontload
• MD/MDX docs read in a processed, i.e. proper doc metadata is added
• MD/MDX docs are processed through createData and generateSidebar

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes if appropriate.
• All new and existing tests passed.

[sserrata]

Currently having issues with getting versionMetadata right.

[github-actions]

Size Change: +24.7 kB (+1%)

Total Size: 3.97 MB

Filename	Size	Change
demo/build/assets/js/17896441.********.js	12.6 kB	+107 B (+1%)
demo/build/assets/js/4c5e977b.********.js	35.9 kB	+446 B (+1%)
demo/build/assets/js/9616.********.js	0 B	-2.23 MB (removed)	🏆
demo/build/assets/js/9a562316.********.js	1.06 kB	+149 B (+16%)	⚠️
demo/build/assets/js/b5257597.********.js	4.17 kB	+235 B (+6%)	🔍
demo/build/assets/js/main.********.js	407 kB	+2.02 kB (0%)
demo/build/assets/js/runtime~main.********.js	8.2 kB	+248 B (+3%)
demo/build/assets/js/42c07454.********.js	5.85 kB	+5.85 kB (new file)	🆕
demo/build/assets/js/466dcb64.********.js	3.54 kB	+3.54 kB (new file)	🆕
demo/build/assets/js/52d34678.********.js	3.02 kB	+3.02 kB (new file)	🆕
demo/build/assets/js/7017.********.js	2.23 MB	+2.23 MB (new file)	🆕
demo/build/assets/js/9f85b634.********.js	3.55 kB	+3.55 kB (new file)	🆕
demo/build/assets/js/c76c11f6.********.js	3.03 kB	+3.03 kB (new file)	🆕

ℹ️ View Unchanged

Filename	Size	Change
demo/.docusaurus/globalData.json	2.22 kB	0 B
demo/build/assets/css/styles.********.css	90.3 kB	+6 B (0%)
demo/build/assets/js/010b0d5d.********.js	7.31 kB	0 B
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demo/build/assets/js/79147915.********.js	17.7 kB	0 B
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demo/build/assets/js/7cc518f2.********.js	8.8 kB	0 B
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demo/build/assets/js/d38d1999.********.js	10.6 kB	0 B
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demo/build/assets/js/fefa319c.********.js	17.8 kB	0 B
demo/build/index.html	72.6 kB	+10 B (0%)

_{compressed-size-action}

[github-actions]

Visit the preview URL for this PR (updated for commit b23f10f):

https://docusaurus-openapi-36b86--pr20-d9wjg5eq.web.app

_{(expires Fri, 15 Apr 2022 22:33:01 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

[blindaa121]

Looks good, frontloaded docs work like a charm! 🚀