This removes the ASDF system definition for Gemma and switches the
code over to buildLisp.
The program builds (including some terrifying hacks to get the
frontend to work), but there are some bizarre runtime issues that I
need to debug.
This moves the various projects from "type-based" folders (such as
"services" or "tools") into more appropriate semantic folders (such as
"nix", "ops" or "web").
Deprecated projects (nixcon-demo & gotest) which only existed for
testing/demonstration purposes have been removed.
(Note: *all* builds are broken with this commit)