Fix CORS preflight issue in w3s.link so we can create spaces and authorize Storacha Gateway to serve content of the new spaces

[fforbeck]

Error while creating new spaces in the Console App:

[fforbeck]

Issue found

We had defined a redirect in Cloudflare Rules which was causing the issue in the CORS preflight request.

The fix was to remove these rules from CF.

[fforbeck]

• Removed both rules, and added a new one to redirect to the docs page.
  New error

[fforbeck]

Fixes

• Remove wildcard http://w3s.link/* redirect rules
• A Rule to redirect any GET https://w3s.link requests to https://web3.storage/docs/how-to/retrieve/
• Add a Worker Route to redirect any https://w3s.link request to the worker (which implements the proxy and handles the cors flight requests properly)
• Add proper caching configs: fix: preflight cors + caching + new route w3link#68

[fforbeck]

• Prod is fixed. The redirect still doesn't work in staging if we use staging.w3s.link, I will move forward and tackle this in another moment.