Adjust the branch reference fixer's logic

- change references to temporary branches (e.g., "release-*" and
  "publish") to point to the 'main' branch
- add --branch=BRANCH_NAME option to the nox session so that
  one can pass in a target branch to make all references point to
- run "fix-branch-references" as the first pre-commit hook
  as it fails the fastest
- bug fix: allow dots in branch references (e.g., "release-0.1.0")