- Added documentation and renamed some constants.
- Turned on the acts tracking geometry.

 - using "athena"
 - this avoids any clashing with the reference detector libraries.

Paying attention to following items:
* Overall parameterization -- will use for optimization
* Constant naming consistency
* Documentation via the comments
* Added new ci job which concatenates all the `<comment>` tags into `docs/detector.md`
* All comments should now be formatted to fit the appropriate section in the markdown file.

	modified:   src/TrapEndcapTracker_geo.cpp

 - [x] Add to `BarrelTrackerWithFrame`
 - [ ] Add to `TrapEndcapTracker
 - [ ] Add to other tracking detectors

	modified:   CMakeLists.txt
	modified:   src/BarrelTrackerWithFrame_geo.cpp

	modified:   TrapEndcapTracker_geo.cpp

This allows for a frame to be defined as the subtraction of 2 trds.

- Implemented using SimpleDiskTracker