This renames the case_log to lettings_log as everything we've written so
far has been geared towards lettings of social housing so it makes sense to
have the name describe this. This is also a precursor to adding in stuff for
sales logs (whatever shape that takes)
Co-authored-by: James Rose <james@jbpr.net>
* Update documentation (content, presentation and images)
* Add some links
* Revert image change for now
Co-authored-by: baarkerlounger <db@slothlife.xyz>