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.

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[github-actions]

This pull request has been automatically marked as stale because it has not had any recent activity.
Please review the PR history and add a reply with any requested information. If no information has been requested, it may be that this contribution does not fit with the project objectives, or does not adhere to the contributing guidelines. If this is in error, please add a reply with further details.
This PR will automactically close in 14 days if no further activity occurs.

[ffflorian]

Ping @jpanther

[github-actions]

This pull request has been automatically marked as stale because it has not had any recent activity.
Please review the PR history and add a reply with any requested information. If no information has been requested, it may be that this contribution does not fit with the project objectives, or does not adhere to the contributing guidelines. If this is in error, please add a reply with further details.
This PR will automactically close in 14 days if no further activity occurs.

[ffflorian]

Not stale