Fix movable points so they don't update bad shapes
Semi-major refactor of button styles. You no longer need to add action-gradient to buttons when you use them. simple-button green/blue/orange is totally sufficient and we weren't actually using those action-gradients anywhere anymore.
Merge branch 'temp'
changed to BLUE
Merge pull request #23364 from mwittels/master

Add exercise: exploring angle pairs 1
Merge pull request #23476 from beneater/perimeter

Add exercise: Perimeter 1
Removed old bingos for experiments that have already been ended.
Clarify answer format
Fix stupid percent bug with MathJax
Add exercise: Divisibility tests
Code review fixes
Merge pull request #23752 from beneater/divisibility-tests

Divisibility tests
Fix up some weird generation to make better answers
Fix up some whitespace, and limit solution more
Copy changes over, to make all better
Add congruent angles exercise
Merge pull request #23767 from xymostech/geometry_fixup

Geometry fixup
Add hints
Add khan-exercise dependencies

Also, remove some duplicate code from the dependency
Remove 'diff' in favor of 'y2'