Font bundling approach

[nijel]

Describe the problem

I would rather not complicate #13093, but there are still some issues with our font bundling:

• The yarn package Source Sans is outdated (3.46.0 versus 3.52 on https://github.com/adobe-fonts/source-sans/)
• The current approach includes non-necessary fonts (see added files in Move source-code fonts to new build workflow #13093)
• We use Source Sans font in woff2 and woff format, and Source Code also in opentype and truetype. Looking at https://caniuse.com/woff2 all we need for browsers is probably woff2 (and TTF for server-side rendering).
• There is no yarn package for the Kurinto font, so that one was included manually.
• We might want to include more fonts which are not available as packages, see Non-Latin fonts for the UI #13200.

Describe the solution you would like

I'm not sure if webpack is the solution here, as the fonts are not really available as yarn packages.

Describe alternatives you have considered

No response

Screenshots

No response

Additional context

No response

[meel-hd]

It would be simple if we defined the font families in css ourselves instead of depending on a package. All we would need is the font files. This way we will insure simplicity, control, and be able to include only what we need keeping storage usage minimal. The sacrifice would be losing auto updates with yarn but I don't think fonts change that much. Plus source-code-pro, source-sans, and kurnito are pretty mature by this time to have weird behavior.

[nijel]

I thought of that as well, together with some automation to extract needed font files.

[nijel]

I've created fonts download in the website repository in WeblateOrg/website#2413, so maybe we could use it here as well.