Fix artificial coupling. Move general code that do not belong in workouts package to secfit package.

Fixed violations of SonarLint rules in frontend and violations of pylints rules in backend

See merge request !6

Fixed files that were in violation of pylints rules. Mostly docstring for modules, classes and methods.

Fixed violations of SonarLint rules in files that we've modified when creating the new features in the Frontend directory.

Configured ESLint to run prettier as well

See merge request !5

Remove all unused imports.

See merge request !4