Removed Google from custom fonts feature

[victrme]

• API:
  • Changed fonts autocomplete provider from googleapis.com to api.fontsource.org
  • No more calls to fonts.googleapis.com and fonts.gstatic.com
  • Directly get .woff2 file from jsDelivr with Fontsource CDN endpoints
• Changes:
  • Only autocompletes fonts available for current language subset
  • Removed variable font implementation for now
  • Slightly faster font load

More infos on jsDelivr: Github - privacy policy, and Fontsource CDN