[BREAKING] refactoring of fc_url

Now it is required to specify port in `frontend.url`.

The `-p` port flag was removed from CLI server.

Related to
#465
4 jobs for 465-dev-share-url-fixes in 48 minutes and 20 seconds (queued for 5 seconds)
latest
Status Job ID Name Coverage
  Cabal
passed #17974
cabal

00:22:09

 
  Stack
passed #17975
stack

00:03:10

 
  Bench
manual #17976
allowed to fail manual
bench
 
  Test
passed #17977
test

00:23:00