Offline support

[MartinElsaesser]

Added offline support via a service worker and reworked your webmanifest.

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[theaquarium]

Hey Martin, thanks for making this change! However, it looks like the service workers are registering only the /matrix/ path, which doesn't actually exist.

[MartinElsaesser]

Well first up I am actually pretty new to doing merge requests. I initially just wanted the offline support commit to be merged. So I pushed the offline support commit to github and made my merge request. After that I reworked the paths to fit the github pages paths. I didn't know that these additional commits were added here as well.

[theaquarium]

1. No worries! Any commits you add to the branch the pull request is connected to will be updated as part of the PR.
2. I'm not sure I totally understand. Do you want this PR to get merged into my repository to be a part of the public site?
3. Either way, your paths seem incorrect:

You're registering a service worker file at /matrix/sw.js

navigator.serviceWorker.register('/matrix/sw.js',

and that is caching files in /matrix/

const PRECACHE_URLS = [
    "/matrix/",
    "/matrix/controls.js",
    ...
    "/matrix/sortandpop.js",
    "/matrix/utils.js",
];

Those files don't exist though. Everything is in the root directory and /matrix/ doesn't exist. Is that right or am I missing something?