- Created a new divider template to generate activity and section dividers
- Refactored templates and styles for the course sections for the new
section dividers
- Changed the topics format 'hasaddsection' property to 'true' so now adding
sections to the bottom of the course will be handled by the format instead
of the last section. Also re-styled this 'Add topic' button.
- Refactored templates and styles for the course activities for the new
activity dividers
- Fixed some related behat that failed because of these changes
- Moved blocks related SCSS to the blocks file and removed some unused SCSS
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