Load mermaid.min.js for now off-site
This MR fixes the mermaid chart rendering for the architecture page by using offsite Mermaid.js from their CDN.
This is until we can merge this change to add proper support: https://gitlab.com/gitlab-com/gitlab-docs/merge_requests/459/diffs
To validate: http://review-docs-fix-m-wigpue.178.62.207.141.xip.io/ce/development/architecture.html#components
Edited by Joshua Lambert