Fix Support PWA so we can easily show OnTime Screens on e.g. mobile devices

[einhirn]

I'm trying to "install" Ontime as PWA on a client device - a tablet that should just show the "/timer" as full screen.

I managed to install Ontime (using a Chrome Flag so I wouldn't need HTTPS in my small local network), but in addition to a separate app screen it still opens a browser screen.

I looked around and #1703 seems to contain some changes to PWA, maybe those will fix the that I'm encountering. Whether "display: standalone" is enough or if "display: fullscreen" would be needed, I don't know.

Thanks for your consideration!

[cpvalente]

Hi!

I agree that this would be a good improvement.
As far as I know, the fix is to make the pages installable by creating a manifest like in the PR you reference
https://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps/Guides/Making_PWAs_installable

However, we never found the time to test this

Perhaps this is something that the community can help with? Maybe you can helps us @einhirn?
This shouldnt be particularly complex, but it may take some trial and error

[einhirn]

Sure, I'll be glad to test dev builds - I haven't yet looked at setting up a local dev environment to accelerate iterations, but I also don't have any real experience with web app developement.