Here's the gist:

 /src/ : website content
 /bin/ : programs and such for generating the website from /src/
 /out/ : where the generated output goes
 Makefile : invoke /bin/ as appropriate
 git-setup : set up git hooks (see below)

The web server should serve the union of /src/ and /out/.

On `master`, /out/ is ignored.  But `git-setup` will set up a git
post-commit hook to generate /out/, and commit it to the
`pre-generated` branch.