Conflicts:
	redirects/wiki-crmdoc.txt

https://wiki.civicrm.org/confluence/display/CRMDOC/Debugging+for+developers

new page: Prerequisite skills

Move/codebase

merge from core

I hope it's okay for me to merge this without any reviewers. Seems small enough and useful/important. Please let me know if I'm overstepping. 

adding document-ready function to js

Scroll to active navigation menu item on page load, when necessary

Admonitions and other improvements to markdown documentation

Move/createmoduleextension

merge from core

Added links to documentation repositories.

and more tidying up and grammar etc

Update markdownrules.md

also bring in about half the options

curtesy of
https://www.iconfinder.com/icons/