Redirect to /dogs if Logged In

[parkerra]

Redirect to /dogs if Logged In

Issue Number(s): #217

If the user is already logged in and tries to go to the Log In or Sign Up page, they will be redirected to /dogs

Checklist

• [x] Requirements have been implemented
• [x] Acceptance criteria is met
• [x] Database schema docs have been updated or are not necessary
• [x] Relevant reviewers (EM) have been assigned to this PR

How To Test

Log in to the website, then go to /login and /signup in the URL without logging out.

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