fix: Update theme to work with Hugo >= 0.146.0

[ffflorian]

When using the theme with Hugo >= 0.146.0, the following error appears:

ERROR error building site: render: [en v1.0.0 guest] failed to render pages: render of "/" failed: "/Users/<username>/Library/Caches/hugo_cache/modules/filecache/modules/pkg/mod/github.com/jpanther/lynx@v1.4.0/layouts/_default/baseof.html:3:6":
execute of template failed: template: index.html:3:6: executing "index.html" at <partial "head.html" .>: error calling partial: "/Users/<username>/Library/Caches/hugo_cache/modules/filecache/modules/pkg/mod/github.com/jpanther/lynx@v1.4.0/layouts/partials/head.html:80:15":
execute of template failed: template: _partials/head.html:80:15: executing "_partials/head.html" at <.Site.Author.name>: can't evaluate field Author in type page.Site

This PR fixes these errors.

See https://gohugo.io/methods/site/params/ for more info.

[netlify]

✅ Deploy Preview for hugo-lynx ready!

Name	Link
🔨 Latest commit	1730e5d
🔍 Latest deploy log	https://app.netlify.com/projects/hugo-lynx/deploys/69b9ad6aa2424a00083e5f5e
😎 Deploy Preview	https://deploy-preview-173--hugo-lynx.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.