This is a temporary fix. I've switched from using ‘@theme’ to ‘@import’ because
the former discards the default theme, and apparently my theme makes some
assumptions about the state of things and requires the default theme to work.
The proper fix would be to fix my theme instead.
This change also fixes a bunch of typos and fixes the use of references within
the theme. References aren't strictly necessary, but my current theme relies on
them and they are technically a valid part of the configuration.
