Rename Cloud Connector blueprint file to index.md
What does this MR do and why?
Just a small follow up to !132977 (merged) to rename the document file.
We need this file to be named index.md
since otherwise it won't appear under https://docs.gitlab.com/ee/architecture/
I also added a call out to the template.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
-
I have evaluated the MR acceptance checklist for this MR.