posts: Update posts to reflect usage of cgit's signature mechanism

cgit can host detached signatures using git-notes(1). Since we want to
make use of that going forward and have finally gotten around to setting
it up fully, we need to make some small changes to
verify-with-signify.md and the weltschmerz project page.

Specifically, we no longer host both the signature and the checksum
(since this would be too cumbersome to maintain with cgit), rendering
the choice explained in the post moot. Since the detached signature has
always contained the checksum, however, we can just fall back to a
slightly different invocation for verifying it.

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