[Documentation] Update SVGO Usage + Repo Links

[michaeljaltamirano]

Summary

I'm updating @svgr/cli in a component library repo (curology/radiance-ui#1307) and noticed some stale documentation with either incorrect instructions or out-of-date links.

SVGO v2 has deprecated .yml files in favor of .js files (svg/svgo@b1dafc6 removed the .svgo.yml file that was linked to, svg/svgo#1328 mentions that config file can only be js now, etc.), and while Github is pretty good at directing links pointing to master to main, since this repo now uses main, it does not do this for .js files converted to .ts, and so those links are broken.

This PR updates both issues to try and make the docs less broken + more helpful to users working with this library.

Test plan

N/A. It would be nice to make some of these links, both external and internal, more robust, but I don't have a good idea how to do that 🙂 🙃

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[michaeljaltamirano]

I did not check this for truth BTW, just assumed it was still true despite the .yml deprecation.

[gregberge]

It is.

[codecov]

Codecov Report

Merging #659 (a1c0eb0) into main (17507b4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #659   +/-   ##
=======================================
  Coverage   92.43%   92.43%           
=======================================
  Files          32       32           
  Lines         727      727           
  Branches      239      239           
=======================================
  Hits          672      672           
  Misses         53       53           
  Partials        2        2           

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