What this PR does / why we need it:
fix a port expose bug according to firefly [official doc](https://docs.firefly-iii.org/installation/docker)
Which issue (if any) this PR fixes:
wrong port to expose, not 80, should be 8080
Fixes #
change container firefly's port (and traefik.port) to 8080
Any other useful info:
NOTE: The majority of traefik ports were totally broken and would never have worked. It should be the external port there, not the internal container port!.
Port conflicts were fixed.