Part of ENG-5153

We would like to separate hosting web app on dev environment to localhost:3000/webapp/ and the keyserver logic to localhost:3000/keyserver/. This means that we want to start we need to replace absolute URL (that point to localhost:3000/) with relative ones.

Depends on D9396

Run yarn dev and yarn prod and check that both notif and database workers are downloaded with /comm/workers/ (this will be changed in the later diffs). Also make sure that on yarn prod opaque-ke and olm wasm files are also loaded through /comm/