Admin login, signup and password reset

[UmairHundekar]

Notion ticket link

Ticket Name

Implementation description

• Added admin signup, login and reset password
• Verification flow for users who did not verify on first register might not work properly (will fix after)
• Created list in auth.py that has valid emails for admins

Steps to test

1. Go to http://localhost:3000/admin-signup
2. Test 3 admin functions (add your email to valid email list in auth.py)
3. Test if regular user authentication still works
4. Test logging in in the wrong side of the website

What should reviewers focus on?

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

[YashK2005]

lgtm!