doc: Add some images

Peter Eisentraut <peter@eisentraut.org>

Commit: ea55aec0a97d6cade0186df1913da2c8cb5c6f2c
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-03-27T22:10:23Z
Releases: 12.0
doc: Add some images

Add infrastructure for having images in the documentation, in SVG
format.  Add two images to start with.  See the included README file
for instructions.

Author: Jürgen Purtz <juergen@purtz.de>
Author: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/aaa54502-05c0-4ea5-9af8-770411a6bf4b@purtz.de

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