Add Authier to Example Apps

[capaj]

Summary

• Add Authier to the Example Apps section.
• Link its canonical homepage and public source repository.
• Describe the browser extension's production Preact use for autofill and password-generation interfaces.

The released v1.2.10-extension source declares Preact 10.29.8 and compiles the shipped content-script TSX with jsxImportSource: 'preact'.

Validation

• git diff --check
• Confirmed this is the only Authier entry and the only changed file.
• Confirmed both submitted URLs return HTTP 200 without redirects.
• npx awesome-lint introduces no new diagnostics; the unchanged upstream baseline and this branch both report 11 warnings and 51 errors.

Checklist

• My contribution hasn't been previously submitted.
• My contribution description is short and simple, but descriptive.
• My contribution follows the format: [Title Case Name](link) - Description..

Disclosure

I maintain Authier. AI assisted with research and preparation of this contribution. Authier is early-stage and has not undergone an independent security audit.