git-commit-each: expand shard handling

Besides a-z shard directories, homebrew/cask also has numeric ones
like `0`, `1`, etc., as well as multi-level `font` directories like
`font/font-0`, `font/font-a`, etc. The existing patterns in
`git-commit-each` don't handle these directories, so I recently
encountered commit messages like `8/8bitdo-ultimate-software: update
url, livecheck` and `font/font-h/font-hermit: update homepage` when
using this script.

This updates `git-commit-each` to handle these directories as well.
I've set up the font pattern so it will handle the existing
`font/font-a` structure but would also handle files in `font/`
itself. That said, it appears that `sed` on macOS can't handle
optional groups like `(something)?` without enabling support for
extended regular expressions (`-E`), so I've used `{0,1}` to achieve
the same goal.

bin/git-commit-each

@@ -6,7 +6,8 @@ for FILENAME in $(git ls-files --modified --others); do
   MESSAGE="$(echo "$FILENAME" | sed -e 's|^Library/Homebrew/||' \
     -e 's|^Formula/||' \
     -e 's|^Casks/||' \
-    -e 's|^[a-z]/||' \
+    -e 's|^[0-9a-z]/||' \
+    -e 's|^font/\(font-[0-9a-z]/\)\{0,1\}||' \
     -e 's|^lib/||' \
     -e 's/\.rb//' \
     -e 's/$/: /')"