Compiles for both Main files + documentation on repo's frontpage.

Both Main files did not compile, for different reasons:

* `NAOH21/Main.cpp` did not compile, because `WRIST_YAW` was used, while commented in its `robotConsts.h`; 
* `NAOH25/Main.cpp` did not compile, because `robotConsts.h` was lacking. I uncommented the `WRIST_YAW` and `HAND` enum values.