Browser-based diff viewer: paste or upload patches, view side-by-side or unified diffs with syntax highlighting.

A pure local diff viewer - view any git diff command in a phabricator-like diff view. For phabricator, you create a diff with `arc diff main` and view it on phabricator server, with this tool you run `local-arc diff 'git diff head~1'` and view diff in browser with a local server