feat: Add variable font Inter to Shopware storefront

[aragon999]

1. Why is this change necessary?

Currently the fonts are only shipped in a non-optimal way, as for each font weight a individual file is shipped.

2. What does this change do, exactly?

Add inter as variable font to the Shopware storefront. I have extracted the available font weights to 400..700.
I have written a little blog post about this: https://machs.space/posts/web-font-optimization-variable-font/

But it boils down to (TLDR):

$ fonttools varLib.instancer -o Inter-italic.reduced.ttf Inter-italic.ttf "wght=400:700"
$ fonttools varLib.instancer -o Inter-roman.reduced.ttf Inter-roman.ttf "wght=400:700"
$ woff2_compress Inter-roman.reduced.ttf
$ woff2_compress Inter-italic.reduced.ttf

Not sure if this should be documented somewhere.

Additionally I updated the existing font-files to version 3.19 for consistency.

3. Describe each step to reproduce the issue or behaviour.

Load the storefront.

4. Please link to the relevant issues (if any).

5. Checklist

• I have rebased my changes to remove merge conflicts
• I have written tests and verified that they fail without my change
• I have created a changelog file with all necessary information about my changes
• I have written or adjusted the documentation according to my changes
• This change has comments for package types, values, functions, and non-obvious lines of code
• I have read the contribution requirements and fulfil them.

[what-the-diff]

• Added support for font-variation
• Removed old fonts and added new ones with the same name but different content (woff, woff2)

[tobiasberge]

Hi @aragon999,

thanks for your contribution! Wow, you really put a lot of effort into this. 😮

Overall it looks good to me and with using @supports I don't see a real concern here. Shipping less font files in the browser is highly appreciated.

[shopwareBot]

Hello,

thank you for creating this pull request.
I have opened an issue on our Issue Tracker for you. See the issue link: https://issues.shopware.com/issues/NEXT-24830

Please use this issue to track the state of your pull request.

[tobiasberge]

Hi @aragon999, your changes were merged to trunk: 84e6608

Thanks again for your effort. 🥳