Move them into the dedicated page on PhpStorm. Why? Tim has expressed
some concern about the potential difficulty (and slippery slope) of
starting to maintain IDE-specific docs. I like the PhpStorm page, but I
can see where he's coming from to a certain extent. As such, I think it
will be a good compromise if we can keep all the IDE-specific stuff as
consolidated as possible.

ref:
https://docs.civicrm.org/dev/en/latest/documentation/style-guide/#parts-chapters-sections

Not adding internal redirects because these pages are so new.

Content in it needs to be re-oragnized into multiple other pages. We'll
leave that for another time.

* They have been moved to the CiviRules Guide:
  https://docs.civicrm.org/civirules/en/latest/
* Close #183

Close #86

by passing custom options to the pygments PHP lexer, now that this is
possbile with pymdown-extensions 2.0

Per request from Josh, this needs to be changed ASAP.
We will find a better name at some point soon.

remove hookref-old.md and move all content into relevant files. Add wordpress setup information for hooks.

- update overview
- add tips and warnings
- add section on hook naming
- replace long code blocks (that focus more on other components) with simpler blocks that show hook usage only
- replace validate with validateForm
 - remove complicated example for setting custom values
 - update tokenValues function to match newer version
 - remove examples of executing raw SQL