Remove irrelevant code

[matthewrsj]

request_handler.py contains code irrelevant to the goal of the application since it was built from external examples and refactored for our use.

Examples of unnecessary code:

• Everything to do with redis

[matthewrsj]

Fixed by https://github.com/osuosl/formsender/commit/4f09647fd8e26ab10ec02f2bfeaa234875d542d0