Revert "IN PROGRESS: Switching from HRD to Google Cloud SQL"

This reverts commit 86090b7a6dd3e74b8ed2635aca86b6f7e54fbcd4.
Revert "Notify clients when cascade steps change"

This reverts commit f3c90434fb5ef70077e0aa9c8d526878895bdd88.
Revert "Redirect students to correct page when phase changed or question disabled"

This reverts commit 5549ebe7f9bf38165ecdcb5d5c6d99fdd7112568.
Revert "Checkpoint: Still working on Cascade.  Make progress on steps 1-3a."

This reverts commit e213e931f78698d4bf2c88ce64b03c9b7f6618c0.
Revert "Checkpoint: Restructuring how to implement Cascade."

This reverts commit 41796c21d2c947915f676fd099e3a0b733275af5.
Revert "Checkpoint: Working on Cascade step 1"

This reverts commit 0c2af8fd5a89c47a27cb6addd634f5426f71fc92.
Revert "Checkpoint: Implementing Cascade"

This reverts commit 18cf7c08bb9552709cc26201b0dbed8cbcfbe4df.
Revert "Checkpoint: Implementing Cascade for grouping ideas"

This reverts commit 091cccd257846fb2a3d41068dfa1f7276c8d1c65.