F24/justin/add user management and admin pages

[JustinScitech]

Notion ticket link

Ticket Name

Implementation description

• Created a skeleton user management page that only admins and behaviourists can access. This can be found at the following route: admin/users

Steps to test

1. Just test using roles as an admin or behavourist if you can go to the route: /admin/users

What should reviewers focus on?

• Just focus on accessing using the different roles

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

[jerry-cheng5]

looks good for the most part, please keep the admin page. It may be converted into an admin dashboard in the future!

[jerry-cheng5]

Looks good!