Freight init UX improvements

[anthr76]

./result-freight/bin/freight init
.git directory missing: stat .git: no such file or directory

# Generating .git/hooks

 INFO  Writing Commit Hooks
  ERROR   ✖ Hook write failed for:  pre-commit open .git/hooks/pre-commit: no such file or directory
open .git/hooks/pre-commit: no such file or directory

During init we shouldn't assume it's being ran from repo root and infer it ourselves

[anthr76]

After talking with @ddymko offline it sounds like it would be better to clean up the error message and instead instruct the user it needs to be ran in the gitroot

[ddymko]

A good 1st step is to have better error messaging then trying to have implicit behavior. From there we can then evolve that out