deps: update to svgo v3.0.5 and update docs

[SethFalco]

I've updated the documentation to use the SVGO v3 syntax, and upgraded to SVGO v3.0.5 which includes many bug fixes and a few more optimizations.

Consider reading the changelogs:

• https://github.com/svg/svgo/releases

Does the following:

• Update the documentation to use the SVGO v3 syntax, the original documentation was outdated.
• Update to SVGO v3.0.5 which has many bug fixes and some optimizations.
• Drop the types for the plugin property as SVGO provides its own already which is more elaborate.
• Replace the link to the SVGO plugins directory in the GitHub repo with the link to the SVGO documentation.

Chores

• Drop the Sticker Mule link from support page, as this link redirects to the homepage.

[ludofischer]

There's one test failure in the css-size package.

[SethFalco]

There's one test failure in the css-size package.

@ludofischer Hmm, seems to be specific to Node.js v20.10.0, and is not related to the changes introduced by this PR.

In all previous versions until then, the test passes as-is. Only when run in Node.js v20.10.0 which is the latest LTS release, both in CI and locally, the result changes to 68 B.

This is related to the Node.js version, though, and occurs in master and so should be affecting all PRs since 22 November 2023.

Since the result differs between versions, perhaps we can loosen the assertion to test for the intent of the test rather than a strict equality. For example, check the format of the message, or check that the value got smaller instead of comparing the exact size?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8eb75bf) 97.56% compared to head (187dd5a) 97.56%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1533   +/-   ##
=======================================
  Coverage   97.56%   97.56%           
=======================================
  Files         123      123           
  Lines       10207    10207           
=======================================
  Hits         9958     9958           
  Misses        249      249           

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