Update .overrides/assets/stylesheets/extra.css,...

Update .overrides/assets/stylesheets/extra.css, .overrides/.icons/geomar/logo-globe-black.svg, .overrides/.icons/geomar/logo-globe-blue.svg, .overrides/.icons/mattermost/mattermost-logo.svg, .overrides/.icons/nextcloud/nextcloud-logo-blue.svg, .overrides/.icons/nextcloud/nextcloud-logo.svg, .overrides/assets/images/favicon-32x32.png, .overrides/assets/images/favicon_dark-32x32.png, .overrides/assets/images/geomar_logo_eng_neg.png, .overrides/partials/languages/de.html, .overrides/partials/languages/en.html, .overrides/partials/authors-date-footer.html, .overrides/partials/footer.html, .overrides/partials/source-file.html, mkdocs.yml