[v2.2.0] New Feature Release / Updates

- Name modified to *CrackTech - Tech Interview Preparation*
- Daily system design, low level design, test engineering, behavioral content recommendation.
- List of system design, low level design, test engineering, behavioral contents.
- Removed the contest and notification features
- Updated popup html.
- Modify relevant pages.
- Chrome-only update.
- Notices updated.
- README updated.