Is your feature request related to a problem?

Most of the Web applications that I use and that are from awesome Docker Container running HTTP server expose, each in their own way, some way to have this Web application installable, whether it is through a simple manifest.json definition, or a full blown PWA.

Describe the solution you'd like

I don't think for now that a PWA is really that interesting since the goal of this project is to act as a redirection server literally, so internet must be enabled, but having this in the list of my installed apps on my Android (Samsung) phone is a great deal for me since I can organize my apps in a Web Apps folder to get access to it quickly, plus the definition of the manifest.json file is really straightforward and does not take long to get right.

Additional context

I've notice that the public folder of the frontend project does not contain a manifest.json file, and although it is possible on Linux Desktop to install it as a Web App, on Android it does only offer the possibility to add it as a shortcut, which on some Android OS does not appear in the installed apps list.