[#203] Implement choose interests page

[shreytailor]

Description:

The intent of this pull request is to implement the Choose Interests page (as described in Issue #203) such that it is displayed after the user registration step. After the user enters their details for registration, the user stays on the /signUp location, but the screen shown would be Choose Interests rather than Register because the AuthContext has a valid token.

A protected route has been added to /signUp which displays the Choose Interests page. If there is a better way to implement this, open to any suggestions.

Note: basic Cypress tests have been added for the page.

Closes #203

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Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
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