Combine new_fe_guide with regular fe_guide
What does this MR do and why?
Having two different sources for frontend docs is confusing. Unclear which to update, and the new
one was pretty barebones, or repeated content from existing guide. Initial reason was to improve the structure of FE Guide, which we can do iteratively instead.
- Move Performance Monitoring to the top of existing fe_guide/performance page
- Move Merge Request Widget Framework docs
- ???
- Delete remaining contents of
new_fe_guide
Edited by Simon Knox