update web manifest for WebAPK

[StefanSchoof]

Update the web manifest for WebAPK installs for nicer icon on Android Homescreen
previous:

with this change;

• added needed properties start_url and display
• removed old and long deprecated field density, see Webapp Manifest 'density' field is deprecated angular/angular-cli#1178
• remove unneeded escaping of /
• Add a maskable icon. I created this with https://maskable.app/ based on icon.svg

Important: To have a WebAPK Install you need to serve the file over https and the ico folder need to be excluded from auth

[r00t-]

LGTM but can't test.

[r00t-]

To have a WebAPK Install you need to serve the file over https and the ico folder need to be excluded from auth

do we provide this setup to users, i.e. in the dockerfile (or does the raspberry pi image have this)?

[StefanSchoof]

No, there is nothing provided. I use traefik with desec and letsencrypt and a google auth to have remote access to my volkszaehler. I share my config under https://github.com/StefanSchoof/traefik-config

I think having this in a image is not an easy task, because there are several other services you need to have configured.

[jahir]

LGTM