ARROW-4194: [Format][Docs] Remove duplicated / out-of-date logical type information from documentation
ARROW-4194: [Format][Docs] Remove duplicated / out-of-date logical type information from documentation

This documentation is not being properly maintained and it duplicates the point-of-truth information in format/Schema.fbs.

I also split out the integration-testing related JSON stuff to a separate section and opened ARROW-5563 about sprucing that up.

Author: Wes McKinney <wesm+git@apache.org>

Closes #4523 from wesm/remove-outdated-metadata-stuff and squashes the following commits:

276412604 <Wes McKinney> Remove duplicated / out-of-date logical type information from documentation and direct readers to Schema.fbs

apache/arrow,apache/arrow,kou/arrow,cpcloud/arrow,xhochy/arrow,apache/arrow,xhochy/arrow,icexelloss/arrow,cpcloud/arrow,renesugar/arrow,laurentgo/arrow,xhochy/arrow,laurentgo/arrow,kou/arrow,majetideepak/arrow,renesugar/arrow,laurentgo/arrow,icexelloss/arrow,cpcloud/arrow,laurentgo/arrow,xhochy/arrow,icexelloss/arrow,renesugar/arrow,icexelloss/arrow,renesugar/arrow,laurentgo/arrow,icexelloss/arrow,majetideepak/arrow,renesugar/arrow,icexelloss/arrow,majetideepak/arrow,kou/arrow,icexelloss/arrow,xhochy/arrow,cpcloud/arrow,kou/arrow,cpcloud/arrow,kou/arrow,majetideepak/arrow,icexelloss/arrow,xhochy/arrow,laurentgo/arrow,kou/arrow,wesm/arrow,majetideepak/arrow,wesm/arrow,apache/arrow,renesugar/arrow,laurentgo/arrow,laurentgo/arrow,renesugar/arrow,apache/arrow,laurentgo/arrow,cpcloud/arrow,renesugar/arrow,icexelloss/arrow,wesm/arrow,cpcloud/arrow,apache/arrow,apache/arrow,xhochy/arrow,icexelloss/arrow,wesm/arrow,xhochy/arrow,icexelloss/arrow,wesm/arrow,xhochy/arrow,majetideepak/arrow,cpcloud/arrow,wesm/arrow,majetideepak/arrow,renesugar/arrow,xhochy/arrow,majetideepak/arrow,apache/arrow,kou/arrow,laurentgo/arrow,wesm/arrow,cpcloud/arrow,majetideepak/arrow,icexelloss/arrow,kou/arrow,laurentgo/arrow,xhochy/arrow,kou/arrow,xhochy/arrow,majetideepak/arrow,xhochy/arrow,wesm/arrow,apache/arrow,cpcloud/arrow,cpcloud/arrow,majetideepak/arrow,wesm/arrow,renesugar/arrow,majetideepak/arrow,renesugar/arrow,wesm/arrow,icexelloss/arrow,wesm/arrow,apache/arrow,apache/arrow,apache/arrow,laurentgo/arrow,wesm/arrow,laurentgo/arrow,majetideepak/arrow,cpcloud/arrow,xhochy/arrow,kou/arrow,wesm/arrow,laurentgo/arrow,kou/arrow,renesugar/arrow,wesm/arrow,xhochy/arrow,majetideepak/arrow,renesugar/arrow,kou/arrow,icexelloss/arrow,kou/arrow,apache/arrow,laurentgo/arrow,cpcloud/arrow,kou/arrow,renesugar/arrow,majetideepak/arrow,apache/arrow,cpcloud/arrow,renesugar/arrow