FIX #641: GitHub Calender working properly

[AdityaMayukhSom]

This pull request is a fix to the issues #641.

The old github-calender package hasn't been updated in the last 2 years and it lacks proper documentation too. Hence I submit a pull request with minimal changes introducing a react based GitHub calendar library named react-github-calender. This library is well documented (documentation) and if updated regularly.

Current new tab with light theme looks like -

Introducing this library reduces -

1. The manual CSS modifications required in case of the previous library.
2. Unnecessary module declaration required with the old library.

Note: This pull request also fixes a TypeError in storage.ts file for a setTimeout function.

[AdityaMayukhSom]

@joelshepherd Could you please give any updates regarding the bug with GitHub calendar?

[EpsilonKu]

Yeah, please.