Misc updates

dotfiles/zshrc.d/cdgr.zsh

@@ -0,0 +1,9 @@
+# Change to the root of the git repository.
+# If not in a git repo, do nothing.
+cdgr() {
+  local git_root
+  git_root=$(git rev-parse --show-toplevel 2>/dev/null)
+  if [ -n "$git_root" ]; then
+    cd "$git_root"
+  fi
+}