Implement auth blocking of the app

[JoshuaYe]

Notion ticket link

Implement auth blocking of the app

Implementation description

• Made home, intake, visit, case overview, and cases private routes (ie. only authorized users can access)

Steps to test

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

[github-actions]

Visit the preview URL for this PR (updated for commit 7cadfb1):

https://childrens-aid-society--pr207-josh-auth-app-auth-b-dep1z9yl.web.app

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[Ezzhingy]

i messed around and got the auth to work—the PrivateRoutes work as intended! Great work :)

Feel free to move this task to completed in the task dash, but don't merge this yet
We'll merge it once we finish most of the other implementations