proposed: Content types: core and custom #151

back: https://github.com/textpattern/textpattern.github.io/blob/master/build/content-types.md
front: https://docs.textpattern.com/build/content-types

Situation/Scenario for proposal

A single doc that discusses core content types, custom content types (per forthcoming functionality), and designing page/form architectures with these kinds of content needs in mind.

Value

This doc enables removing all the content panel pages, and should serve as a segue to building site structures doc.

Resources to consider for draft

Add information text and link

• link
• link
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  etc