Configure many BIS legacy domains on transition tool

This pull request contains the configuration of many (but not all) BIS legacy domains on the transition tool. 

Additionally, it allows for previously configured domains to use the global append path feature where appropriate.
These don't resolve to anything other than 'Bad hostname'. I'm not sure of what `diversity.bis.gov.uk` is, therefore, or `elearning`. In my brain, they seem like different things? I have no context though - please elaborate!