fix: remove unused font loading configurations

[jaygiang]

Problem

InterVariable.woff2 is downloaded twice on every page load. The <link rel="preload"> in headTags points to /docs/fonts/Inter/InterVariable.woff2?v=4.0, but Docusaurus/webpack hashes the CSS @font-face URL to /docs/assets/fonts/InterVariable-{hash}.woff2. Since the URLs don't match, the browser treats them as separate resources and downloads both.

Fix

• Emptied headTags array in docusaurus.config.ts to remove the mismatched font preload
• Removed unused "Inter var" legacy @font-face declarations from theme.css
• Removed 20 unused static "Inter" weight @font-face declarations from theme.css

Related Issue or Design Document

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
  If this pull request addresses a security vulnerability,
  I confirm that I got approval (please contact security@ory.com) from the maintainers to push the changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added the necessary documentation within the code base (if appropriate).

Further comments

References:

• Preload fonts with Docusaurus — Johnny Reilly