[chore] Swizzle docusaurus components to use StyleX for everything

[nmn]

What changed / motivation ?

Docusaurus allows the ability to "eject" the built in theme components so they can be customized. This is being done to migrate the styling from CSS files to StyleX for everything.

• Footer components
• ThemedImage
• ... Everything else ...

[github-actions]

workflow: benchmarks/perf

Comparison of performance test results, measured in operations per second. Larger is better.

[email protected] compare
node ./compare.js /tmp/tmp.c4tTUvKxDE /tmp/tmp.FIp72A4kcT

Results	Base	Patch	Ratio
babel-plugin: stylex.create
· basic create	558	558	1.00
· complex create	68	67	0.99	-
babel-plugin: stylex.createTheme
· basic themes	453	454	1.00	+
· complex themes	44	45	1.02	+

[github-actions]

workflow: benchmarks/size

Comparison of minified (terser) and compressed (brotli) size results, measured in bytes. Smaller is better.

[email protected] compare
node ./compare.js /tmp/tmp.FaTkxaYc5t /tmp/tmp.YEaBgestUR

Results	Base	Patch	Ratio
@stylexjs/stylex/lib/cjs/stylex.js
· compressed	1,311	1,311	1.00
· minified	4,150	4,150	1.00
@stylexjs/stylex/lib/cjs/inject.js
· compressed	1,223	1,223	1.00
· minified	3,216	3,216	1.00
benchmarks/size/.build/bundle.js
· compressed	496,650	496,650	1.00
· minified	4,847,840	4,847,840	1.00
benchmarks/size/.build/stylex.css
· compressed	99,853	99,853	1.00
· minified	747,541	747,541	1.00