Revamp frame data transfer between frontend and backend

[stanreee]

Currently sending frames continuously to the backend from the frontend.

Issue with mediapipe timestamp mismatch was fixed in issue #75, however, while this solution works for static handsigns, it is not a feasible solution for dynamic handsigns which require a more continuous stream of frames.

Suggestions:

• Look into mediapipe for the frontend, and send landmark data to the backend rather than sending frame data
• Rather than sending a live feed of frames to the backend, consider a "recording" period where only the frames captured are bundled and sent to the backend

[stanreee]

Fixed this issue on commit d23b29e by moving the mediapipe processing to the frontend.