Build with orgo

The generator changes; the steps around it that orgo does not do stay. Four of
them go, because it does:

- the blog index groups itself by year (a template, using page.year)
- the tags page is a collection
- the recent-posts list on the home page comes from the blog collection
- the sitemap is written once site.base_url is set

What remains is minifying CSS, copying the org sources for readers who want
them, and rewriting img.cleberg.net to /img/ so the onion serves images from its
own origin. That last one is why this script still exists.

Verified against the live site before deploying: 195 pages, 186 identical in
content, and every URL in the live sitemap still produced. The nine that differ
are the ones we chose — the reply footer is opt-in now, /tags/ has a page per
tag, and footnotes carry aria labels.

publish.el and theme/templates/ are left alone. They are weblorg's, and there is
no reason to delete a fallback on the same day the replacement goes live.

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