Modernize create-entity.md, updates from what we learned from ECK

See merge request documentation/docs/dev!1005

add saved search in extension bit and include refer in step by step guide

See merge request documentation/docs/dev!1004

updated directory description in entity structure

See merge request documentation/docs/dev!1003

links and paths

See merge request !1002

bring SearchKit inline with what was decided in Otterlo sprint -> Search Kit...

See merge request !1000

bring SearchKit inline with what was decided in Otterlo sprint -> Search Kit and add bit on adding paths in xml schema

Indicate that `extern/rest` is the deprecated method

See merge request !999

Simplify post hook example, and make example code more efficient, too.

See merge request !998

Update API4 count method documentation

See merge request documentation/docs/dev!997

Afform - document events

See merge request documentation/docs/dev!996

Fix the hook_civicrm_permission example

See merge request documentation/docs/dev!995

Add chapter about workflow messages. Update token docs.

See merge request documentation/docs/dev!987

framework/queues - Add "History" subsection

See merge request documentation/docs/dev!994

docs: add note on APIv4 entity casing

See merge request documentation/docs/dev!993

Update queue documentation to preferred Civi::queue

See merge request documentation/docs/dev!991

The documentation currently refers to an earlier way to instantiate the queue - I couldn't see any reason to use anything other than \Civi::queue since the 2 functions seemed to be basically 'is reset being passed in or not' and we really want to give one recommended method rather than lots of 'choice for choice's sake'

However - it might make sense to move the other methods to a separate 'legacy queue interaction' session

APIv4 - Document Export action and Match param

See merge request documentation/docs/dev!988

Add route parameter reference to angular js

See merge request documentation/docs/dev!990

Add brief money formatting note

See merge request documentation/docs/dev!989

I have some doubts about the structure but that can change later