Finish the move off weblorgmigrate-to-orgo

Remove what the migration left behind, then cut build.py down to the work
orgo does not do: 443 lines to 168.

- Delete publish.el and theme/templates/, superseded by content/orgo.toml
  and content/templates/. theme/static/ stays; orgo publishes it as assets.
- Drop the tag builder, the org-source copy, and the helpers that only fed
  them. orgo generates /tags/ and a page per tag from a collection.
- Rewrite the README and the migration-era comments that explained the
  config by pointing at what weblorg used to do.
- Serve styles.css as authored. Minifying 1KB of CSS saved 52 bytes over
  the wire once compressed, which did not pay for a build step and a
  toolchain dependency.
- Stop wiping the output directory. The .orgo-cache.json inside it is what
  makes a build incremental, and orgo already prunes outputs whose source
  is gone and re-emits any that are missing. Production keeps .build/ and
  development gets .build-dev/, because production rewrites image URLs in
  the output and a shared directory would let one environment reuse pages
  rendered for the other.

An incremental build is byte-identical to a clean one, and the site output
is unchanged apart from the /uses/ stack row.

1 files changed, 0 insertions, 13 deletions

diff --git a/theme/templates/blog.html b/theme/templates/blog.html
deleted file mode 100644
index b2e2b72..0000000
--- a/theme/templates/blog.html
+++ /dev/null
@@ -1,13 +0,0 @@
-{% extends "base.html" %} {% block subtitle %}blog - {% endblock %} {% block main %}
-<h1>Blog</h1>
-<p>Use <code>⌘ F</code> / <code>Ctrl F</code> to search &middot; <a href="/feed.xml">RSS Feed</a></p>
-<p>Want to browse by topic instead? Head over to the <a href="/tags/">tags</a> page.</p>
-<ul class="post-list">
-    {% for post in posts %}
-    <li class="post-list-item">
-        <time datetime='{{ post.date | strftime("%Y-%m-%d") }}'>{{ post.date|strftime("%Y-%m-%d") }}</time>
-        <a href='{{ url_for("blog", slug=post.slug) }}'>{{ post.title }}</a>
-    </li>
-    {% endfor %}
-</ul>
-{% endblock %}