docs: Do not require authentication to view documentation

[magarpratik]

Closes #4637

This PR implements logic to ensure authentication is not required to view documentation.

[vercel]

@magarpratik is attempting to deploy a commit to the polar-sh Team on Vercel.

A member of the Team first needs to authorize it.

[frankie567]

Hmm, I've just checked and was able to access to docs.polar.sh or 127.0.0.1:3000/docs unauthenticated without any problem.

Under which circumstances did you hit this problem?

Never mind, should have read the issue first 😅 I'll have a closer look

[frankie567]

Ok, I get it now 👍 The problem comes from the fact that, on docs.polar.sh, we redirect pages like /docs/finance/balance to /finance/balance, which then falls under the authenticated route.

Not 100% sure the .startsWith('/docs/') is necessary, but that'll be good enough for now!

Thank you again @magarpratik 👍