Re-used existing route and moved tinymce help to its own different
route. Added test to cover.
Added new external-content block to support in editor UI.
Remove the Shift for the numeric shortcut for incline code.
Ctrl+8 instead of Ctrl+Shift+8
I assume Mac is the same but I do not have a Mac to test with.
- To display license info along with shortcuts.
- Extracted out plain layout from 503 error page.
- Added tests to ensure license references are as expected.