Route blog posts through post.html

The reply-by-email and Bubbles lines were emitted from base.html behind a test
on the page's URL, because org-ssg had no way for a page to pick a layout. It
does now, so they live in a post.html that extends the shared one — the same
split weblorg has between theme/templates/base.html and post.html — selected by
a [[pages]] rule for blog/.

All 169 posts carry the footer; /blog/ itself does not, being a generated
listing rather than a post.

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