the backend code has been added back in, and the build process has been
modified so that no output files are left outside of build/. Admin page
loads and logs in correctly, nothing else functionality-wise yet.
user templates will become profiles. You will be able to make multiple,
and assign them to invites individually. This commit migrates the
separate template files into one profile entry called "Default", and
lets you select them on invites. No way to create profiles has been
added yet.
Added script to convert config-base.json into a go struct, so that
access to config values and metadata could be unified and simpler. It
probably won't see any actual use though as mapping the ini into it is
painful.