refs https://github.com/TryGhost/Members/commit/9e59f5a9
Since we have a DynamicRedirectManager for handling adding/removing
redirects at runtime, we no longer need the custom-redirects middleware.
The redirects service does however need an init method now to add the
custom redirects at Ghost boot, so it's been refactored into our Class &
DI pattern.
- we're slowly trying to draw the lines between the backend and the frontend correctly
- these files deal only with serving the frontend so they should live there
- there are lots of mixed requires in these files, so having them in the right place makes that clear
- this is a small part of a bit of cleanup of our test files
- the goal is to make the existing tests clearer with a view to making it easier to write more tests
- this makes the test structure follow the codebase structure more closely
- eventually we will colocate the tests as we break the codebase down further
