Revert "Using workers"

This reverts commit 65c2bfc733ba6d3398208cfd57773984445022b1.
Revert "Added RQ and worker"

This reverts commit dc9b6801345ece7272089023a48c6aa15de3af2a.
Use small DB
Add small SQLite db
Disable submit button while loading
Height fix
Ignore database.db and remove unnecessary files