feat: support python -m livereload invocation

[krisvandecruys]

Summary

Adds livereload/__main__.py so the development server can be started with:

python -m livereload [directory]

This mirrors the familiar pattern established by python -m http.server from the standard library, which many developers already reach for when they need a quick local server.

The implementation delegates directly to the existing cli.main() entry point — no behaviour changes, no new arguments, no new dependencies. The __main__.py is three lines.

Before / After

Before:

# Required a one-liner or a dedicated script
python -c "from livereload import Server; Server().serve(root='.')"

After:

python -m livereload
python -m livereload ./docs
python -m livereload --port 8080 ./site

Test plan

• python -m livereload --help shows the existing CLI help
• python -m livereload . serves the current directory with live reload
• python -m livereload ./subdir serves a subdirectory correctly
• All existing CLI flags (--host, --port, --target, etc.) work as before

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