Update Parameters for new Hugo Versions

[j0hax]

This PR fixes two error messages I encountered when using Hugo v0.162.0:

Deprecated in v0.124.0:

ERROR error building site: render: [de v1.0.0 guest] failed to render pages: render of "/var/home/johannes/Projects/clara-und-johannes.de/content/_index.md" failed: "/var/home/johannes/.cache/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: "/var/home/johannes/.cache/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

Deprecated in v0.158.0:

WARN deprecated: .Site.LanguageCode was deprecated in Hugo v0.158.0 and will be removed in a future release. Use .Site.Language.Locale instead.

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