Whoa, was that a detour or what? Pelican doesn't allow me to compile in relative links either. It comes with much prettier themes, but even to install it requires the world. It does allow me to specify a separate configuration for testing, so I can compile in a local file:// URL. But so does Mnemosyne! I just need to invest a little effort to understand its sparse documentation, and readjust my tools for writing and publishing posts, since Mnemosyne depends on the fact that the entries are stored in a maildir.