Progressive Web App (PWA) support

[RayBB]

Is your feature request related to a problem? Please describe.

It would be great if we could get some basic PWA setup going to start caching. Right now when I'm on a slow connection it can be quite slow to load the page.

First step is to just cache the response to show right away and then show updates once we get them from the server. Later we could think about things like adding tasks when offline and sending later.

Describe the solution you'd like

The memories app has a pretty good PWA that we could look at for inspiration

https://github.com/pulsejet/memories/blob/e765a89989c42cd51e39ecfe053cf8625837d3ab/src/service-worker.ts

Describe alternatives you've considered

No response

Additional context

No response