Fix start command invocation

[pwoolcoc]

When I tried to start the server using the command ./gotosocial server start --config-file ./config.yaml, I got the following error:

root@gotosocial-experiment:/gotosocial# ./gotosocial server start --config-file ./config.yaml
Incorrect Usage: flag provided but not defined: -config-file

NAME:
   gotosocial server start - start the gotosocial server

USAGE:
   gotosocial server start [command options] [arguments...]

OPTIONS:
   --help, -h  show help (default: false)

FATA[0000] flag provided but not defined: -config-file

Putting the flag after the ./gotosocial but before the server start seems to work properly

[tsmethurst]

The docs are ahead of the release unfortunately: on main, we already redid a bunch of the CLI stuff to make it so you can put the flags in practically any order, so in the next release the docs will be correct. But i'll pull this in anyway, because for the current release it's indeed bum that the flags are incorrectly documented.

Thanks for the PR!