Set https://support-bundle.replicated.com to point to useful specs

[xavpaice]

From #58: Update the DNS address for https://support-bundle.replicated.com/ to point to the raw result of in-cluster/default.yaml

Additional comment in the original issue: I think we can serve both in-cluster and host default specs using https://support-bundle.replicated.com?spec=in-cluster or https://support-bundle.replicated.com/in-cluster. I prefer the latter cause of ease of caching

Definition of done:

• URL https://support-bundle.replicated.com redirects to a support-bundle spec that is generically useful
• there are sub-urls (or query paths) that can be more specific
• docs have links updated