ERM Documentation
This is a first draft conversion of a google doc of the documentation to rst.
NOTES:
- Permissions documentation may need syncing to what they look like in Koha and cross linking adding.
- Authorized values documentation may need crosslinks adding.
- The new ERM chapter needs looking at for crosslinks.
- Images are under an /erm subdirectory under /images.. but they're all called imageXX.png and I've removed the automated height/width restrictions pandoc added.
- Images are currently referenced directly and do now contain alt text.