remoto.el lets you browse any GitHub repository in Emacs as if it were
cloned locally - without cloning it.  It registers a virtual filesystem
via `file-name-handler-alist' that translates Emacs file operations into
GitHub API calls via the `ghub' library.

Loading this file defines things and changes nothing.  `global-remoto-mode'
is the switch: it installs the file-name handler, the `find-file' and
`dired' URL rewriting, the completion metadata, and the auto-enabling of
`remoto-mode' in remoto buffers, and removes all of them when turned off.

Usage:
  C-x C-f /github:torvalds/linux RET
  M-x remoto-browse RET https://github.com/torvalds/linux RET

Both turn the mode on when it is off: `remoto-browse' itself, and the
path through `remoto-autoload-file-name-handler', which the package
autoloads register for `/github:' and `/gh:' paths the way TRAMP
autoloads on a remote path.  `(global-remoto-mode 1)' in the init file
turns it on ahead of time.  `remoto-browse' supports pasting any GitHub
URL, git remote URL, or owner/repo shorthand.