Refactor
Migrated:
- From Reactstrap & Bootstrap to Material-UI (with css in js).
- (new deploy system) From gh-pages to respective GitHub Action.
- (new game feel) Add simple animation.
Improvements
- Add ASDF to keyboard layout.
- Improve a little bit performance.
New features
- Display key on tile when playing using gamepad or keyboard.
- Gamepad support.