feat(dotfiles): add reinstall-nvim subcommand

- New 'dotfiles reinstall-nvim': clean rebuild of nvim from the
  currently checked-out submodule tag (prompted), independent of
  sync's version check.
- Fix build_and_install_nvim: rm targeted $build_dir/build
  (install prefix, nonexistent) instead of the real build tree;
  now clears $src_dir/{build,.deps} so rebuilds are from scratch.
  sync only worked before because a new tag changed sources.
- Add reinstall-nvim to the _comp_dotfiles completion.

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