[Enhancement] Use docs with embedded links as category link

[sserrata]

Description

See #112 for problem this PR addresses.

• Adds new *.tag.mdx doc type

Motivation and Context

Enables markdown/MDX support for tag descriptions when setting categoryLinkSource to "tag".

How Has This Been Tested?

This has not been fully tested but will update once a suitable spec file is found.

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]

Tested by modifying the existing Petstore OAS:

Screen.Recording.2022-06-01.at.9.37.25.AM.mov

[github-actions]

Size Change: +14.5 kB (+1%)

Total Size: 2.73 MB

Filename	Size	Change
demo/build/assets/js/14eb3368.********.js	8.88 kB	+91 B (+1%)
demo/build/assets/js/7ac26ed1.********.js	0 B	-438 B (removed)	🏆
demo/build/assets/js/8e4a0e36.********.js	0 B	-445 B (removed)	🏆
demo/build/assets/js/935f2afb.********.js	21.8 kB	+582 B (+3%)
demo/build/assets/js/cdd5af7d.********.js	0 B	-494 B (removed)	🏆
demo/build/assets/js/main.********.js	413 kB	-161 B (0%)
demo/build/assets/js/05f64ae1.********.js	5.1 kB	+5.1 kB (new file)	🆕
demo/build/assets/js/47abaca6.********.js	5.2 kB	+5.2 kB (new file)	🆕
demo/build/assets/js/8d4e78cd.********.js	5.11 kB	+5.11 kB (new file)	🆕

ℹ️ View Unchanged

Filename	Size	Change
demo/.docusaurus/globalData.json	10.1 kB	-27 B (0%)
demo/build/assets/css/styles.********.css	84.3 kB	0 B
demo/build/assets/js/01a85c17.********.js	2.72 kB	0 B
demo/build/assets/js/031793e1.********.js	214 B	0 B
demo/build/assets/js/06e5f0f0.********.js	36.5 kB	0 B
demo/build/assets/js/096bfee4.********.js	260 B	0 B
demo/build/assets/js/0b8a056b.********.js	9.18 kB	0 B
demo/build/assets/js/0ccfb8d7.********.js	449 B	0 B
demo/build/assets/js/0e384e19.********.js	5.91 kB	0 B
demo/build/assets/js/1639936b.********.js	3.69 kB	0 B
demo/build/assets/js/18c41134.********.js	16.9 kB	0 B
demo/build/assets/js/1be78505.********.js	10.9 kB	0 B
demo/build/assets/js/1e4232ab.********.js	5.62 kB	0 B
demo/build/assets/js/1f391b9e.********.js	2.6 kB	0 B
demo/build/assets/js/1f818248.********.js	18.9 kB	0 B
demo/build/assets/js/2610c6ee.********.js	25 kB	0 B
demo/build/assets/js/2a3d8b7d.********.js	18.6 kB	0 B
demo/build/assets/js/2b60538e.********.js	22.9 kB	0 B
demo/build/assets/js/2c860537.********.js	13.9 kB	0 B
demo/build/assets/js/2ee3fbbb.********.js	18.1 kB	0 B
demo/build/assets/js/30a24c52.********.js	207 B	0 B
demo/build/assets/js/36675a4b.********.js	29.3 kB	0 B
demo/build/assets/js/393be207.********.js	3.08 kB	0 B
demo/build/assets/js/39d00f16.********.js	7.95 kB	-3 B (0%)
demo/build/assets/js/4360.********.js	118 kB	0 B
demo/build/assets/js/4920.********.js	13.4 kB	0 B
demo/build/assets/js/4bdd3fbe.********.js	22.3 kB	0 B
demo/build/assets/js/4c5e977b.********.js	31.3 kB	0 B
demo/build/assets/js/4c9e35b1.********.js	256 B	0 B
demo/build/assets/js/533a09ca.********.js	4.96 kB	0 B
demo/build/assets/js/534cc848.********.js	431 B	0 B
demo/build/assets/js/5570.********.js	1.1 MB	0 B
demo/build/assets/js/59362658.********.js	5.14 kB	0 B
demo/build/assets/js/5c868d36.********.js	5.7 kB	0 B
demo/build/assets/js/5fb917be.********.js	9.58 kB	0 B
demo/build/assets/js/608ae6a4.********.js	262 B	0 B
demo/build/assets/js/6119.********.js	1.09 kB	0 B
demo/build/assets/js/66406991.********.js	256 B	0 B
demo/build/assets/js/6875c492.********.js	9.6 kB	0 B
demo/build/assets/js/6b63c616.********.js	27.7 kB	-10 B (0%)
demo/build/assets/js/73664a40.********.js	7.18 kB	0 B
demo/build/assets/js/7633a546.********.js	17 kB	0 B
demo/build/assets/js/7661071f.********.js	5.23 kB	0 B
demo/build/assets/js/7a6145e6.********.js	416 B	0 B
demo/build/assets/js/7a7d82e8.********.js	24.2 kB	0 B
demo/build/assets/js/814f3328.********.js	392 B	0 B
demo/build/assets/js/822bd8ab.********.js	5.34 kB	0 B
demo/build/assets/js/838d665e.********.js	191 B	0 B
demo/build/assets/js/85ec4403.********.js	11.4 kB	0 B
demo/build/assets/js/8717b14a.********.js	3.98 kB	0 B
demo/build/assets/js/8ab9b16e.********.js	16.6 kB	0 B
demo/build/assets/js/925b3f96.********.js	4.22 kB	0 B
demo/build/assets/js/93304a97.********.js	3.82 kB	0 B
demo/build/assets/js/9c58e5d3.********.js	23.5 kB	-1 B (0%)
demo/build/assets/js/9e4087bc.********.js	1.7 kB	0 B
demo/build/assets/js/a6aa9e1f.********.js	9.02 kB	0 B
demo/build/assets/js/a6cd895f.********.js	27.5 kB	-1 B (0%)
demo/build/assets/js/a7023ddc.********.js	518 B	0 B
demo/build/assets/js/a80da1cf.********.js	218 B	0 B
demo/build/assets/js/b2b675dd.********.js	245 B	0 B
demo/build/assets/js/b2f554cd.********.js	8.79 kB	0 B
demo/build/assets/js/b802b434.********.js	411 B	0 B
demo/build/assets/js/b8b62e90.********.js	26.6 kB	0 B
demo/build/assets/js/bf9a5101.********.js	24.7 kB	0 B
demo/build/assets/js/c2838c41.********.js	24.2 kB	0 B
demo/build/assets/js/c4f5d8e4.********.js	72.7 kB	0 B
demo/build/assets/js/c800bce3.********.js	556 B	0 B
demo/build/assets/js/c844b82d.********.js	441 B	0 B
demo/build/assets/js/ccc49370.********.js	11.1 kB	0 B
demo/build/assets/js/cfd5b083.********.js	415 B	0 B
demo/build/assets/js/d69e68dd.********.js	17.4 kB	0 B
demo/build/assets/js/d90c1c35.********.js	18 kB	0 B
demo/build/assets/js/d9f32620.********.js	5.23 kB	0 B
demo/build/assets/js/dd696920.********.js	23.6 kB	-1 B (0%)
demo/build/assets/js/dff1c289.********.js	6.34 kB	0 B
demo/build/assets/js/e16015ca.********.js	205 B	0 B
demo/build/assets/js/e273c56f.********.js	4.22 kB	0 B
demo/build/assets/js/e44a2883.********.js	7.67 kB	0 B
demo/build/assets/js/e5cbb61f.********.js	192 B	0 B
demo/build/assets/js/e5e5340c.********.js	9.48 kB	0 B
demo/build/assets/js/e6f78ab2.********.js	15.8 kB	0 B
demo/build/assets/js/ea88f2a1.********.js	474 B	0 B
demo/build/assets/js/ecc39b49.********.js	191 B	0 B
demo/build/assets/js/eff95040.********.js	27.1 kB	0 B
demo/build/assets/js/f4f34a3a.********.js	5.14 kB	0 B
demo/build/assets/js/f55d3e7a.********.js	5.17 kB	0 B
demo/build/assets/js/fdd24af5.********.js	16.9 kB	-10 B (0%)
demo/build/assets/js/runtime~main.********.js	7.95 kB	-1 B (0%)
demo/build/index.html	74.8 kB	0 B

_{compressed-size-action}

[github-actions]

Visit the preview URL for this PR (updated for commit 69e3ddb):

https://docusaurus-openapi-36b86--pr114-0o2jxn5l.web.app

_{(expires Fri, 01 Jul 2022 15:01:15 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

[sserrata]

Also confirmed that no "tag docs" are generated if categoryLinkSource is undefined or set to "info".