Feature: Hierarchical list of categories

[klemens-st]

Allow formatting like:

Cat5
- Cat51
-- PostA in Cat51
-- PostB in Cat51
- Cat52
-- Cat521
--- PostC in Cat521
-- Cat522
--- PostC in Cat522
--- PostD in Cat522
--- PostE in Cat522

https://wordpress.org/support/topic/hierarchical-list-2/

[klemens-st]

This kind of thing belongs in a template. We could add another template to the templates dir or just create another gist and link to it in the wiki.

Gists we already have that achive a somewhat similar goal:

• https://gist.github.com/klemens-st/4cb9f17a4b7a50287f6dc64a68faa3d9
• https://gist.github.com/klemens-st/e46ae830e42fb7a200306cfaa87ba18a