Artuchka / testing_minesweeper_fp

minsweeper/fp code refactored a little bit, so now it has more pure functions in `logic.js` section

Testing Minesweeper FP

Minsweeper/fp code refactored a little bit, so now it has more pure functions in logic.js section

1. Unit testing is done with jest (tested only export functions)
2. E2E testing is done with cypress