Some improvements/fixes

[MaluNoPeleke]

The Chrome developer console shows me some problems with the theme that might be fixed/improved:

• The service worker navigation preload request was cancelled before 'preloadResponse' settled. If you intend to use 'preloadResponse', use waitUntil() or respondWith() to wait for the promise to settle.

• main.js?v=05d6f981e7:formatted:1226 Resource interpreted as Stylesheet but transferred with MIME type text/plain: "https://unpkg.com/lightgallery.js/dist/css/lightgallery.min.css".

• [Violation] Added non-passive event listener to a scroll-blocking 'touchstart' event. Consider marking event handler as 'passive' to make the page more responsive. See https://www.chromestatus.com/feature/5745543795965952 (anonymous) @ base.js:6049

• [Violation] 'setTimeout' handler took 78ms www-embed-player.js:443

Here is an article about the third topic.