Move source-code fonts to new build workflow

[meel-hd]

Proposed changes

Moved source-code fonts to new build workflow

Changes Include:

• Removed the old scripts/yarn/** dir, as it is no longer needed.
• Moved source-code-pro and source-sans to client/
• Built and bundled the fonts.
• Updated templates to use the new built fonts and styles.
• Added new built bundles license info in REUSE.toml.

Note:

• The old bundles did not get removed to keep this PR simple for review.

TODO:

• Remove old fonts bundles.
• Update any dependents on them to use the new bundles.
• if FONTS_CDN_URL is configured it should be seted up with static/js/vendor/fonts instead of the old font-source/
• Remove the old yarn-update script and its configs and workflows

Related: #12172

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

Other information

[nijel]

The docs/conf.py also needs to be changed to use the new location of the fonts. I've made the docs build fail when the fonts directory doesn't exist in 425131e.

[meel-hd]

@nijel I rerun the test suite on main (without the new changes) and it seems they fail also in there, I'm not sure what to do next.

summary

weblate/trans/tests/test_selenium.py::SeleniumTests::test_add_component missing element #list-add-button
weblate/trans/tests/test_selenium.py::SeleniumTests::test_fonts missing element #upload_font_submit
weblate/trans/tests/test_selenium.py::SeleniumTests::test_login missing element #dashboard-return
weblate/trans/tests/test_selenium.py::SeleniumTests::test_screenshots missing element #query-dropdown
weblate/trans/tests/test_selenium.py::SeleniumTests::test_weblate

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.95%. Comparing base (8b7609f) to head (c12d6a5).
Report is 354 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13093      +/-   ##
==========================================
- Coverage   90.97%   90.95%   -0.03%     
==========================================
  Files         599      601       +2     
  Lines       62058    62390     +332     
  Branches     6397     6453      +56     
==========================================
+ Hits        56457    56744     +287     
- Misses       3944     3974      +30     
- Partials     1657     1672      +15     

Files with missing lines	Coverage Δ
weblate/fonts/utils.py	92.00% <ø> (-2.00%)	⬇️
weblate/trans/tests/test_selenium.py	96.09% <ø> (ø)

... and 56 files with indirect coverage changes

[nijel]

Merged, thanks! I've made a fix to the testsuite (and reverted unnecessary changes there).

[nijel]

And I didn't notice messed up licensing info, fixed that now in 1781de2.

[nijel]

I've created a followup issue at #13255. Using webpack is better than what we had before, but we might need something different in the end.