* Added MS_GRAPH_CLIENT_* credentials to .env.example.
* Refactored the google integration into an abstraction layer for creating events and getting the user schedule from either Google or Office 365.
* FIX: when re-authorizing the Google Integration the refresh_token would no longer be set and the google integration would stop working.
* Updated Office 365 integration image
- Increasing the padding of "Your integrations" tile to match the height of "Welcome to Calendso!" tile in medium and large size screens.
- Tweaking rounding of corners of the "Welcome to Calendso!" tile so it matches the styling of "Your integrations" tile in all screen sizes.