[Feature] Create admin dashboard for Change logs related queries

[rohithbalaji123]

This issue is a start to a bigger issue #347 which concentrates on adding an admin dashboard with a constrained functionalities of supporting CRUD operations related to Change Logs.
This issue will have multiple PRs split in the form of,

• Design a wireframe for the layout of the admin page (offline, will be updated once finalized).
• Design [reusable] React components for the purpose.
• Implement the UI with dummy data.
• Build authorizer to handle admin authorizations.
• Add CRUD GraphQL APIs for change logs (C and R already covered in [Feature] Create backend GraphQL APIs for change logs #566 ).
• Integrate the above functionalities together with actual data.

[magicoder10]

@rohithbalaji123 We also need to implementation authorizer to handle permissions: https://martinfowler.com/articles/web-security-basics.html#AuthorizeActions

[magicoder10]

For your information, I am refactoring authenticator: #611
This is just a prototype. Will split into small PRs and clean up.

[rohithbalaji123]

@byliuyang
Okay, updated the issue.
Also, I guess, we would need a separate login page for admin site. Having a modal like in main site doesn't look completely secure for admin actions. What are your thoughts?

[magicoder10]

@rohithbalaji123 I saw some critical large scale system sharing the same sign in page. However, I do see them having two factor authentication. We may want to force 2-factor authentication for admin accounts.

[magicoder10]

Here is template prototype I made: #651
Need your help to clean it up and productionize the code.

[magicoder10]

[magicoder10]