fix: encode svg to Base64, prevent build optimizer error

[loetscher]

Possible fix for #900

See also

• undefined:2:1230: property missing ':' when using background with Data URI reworkcss/css#154
• Index html generation failed. property missing ':' angular/angular-cli#20760
• Building with "nx build --prod" leaves error: "Index html generation failed." nrwl/nx#4381

[scttcper]

🎉 This PR is included in version 14.1.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[XhmikosR]

Note that this is not only redundant for browsers but also results in bigger CSS files.

This should be enough for the non-Bootstrap styles: https://yoksel.github.io/url-encoder/. For Bootstrap styles you can use our escape-svg() function.