Squashed 'docs_source/' changes from 7048689..04619c0

04619c0 Add diagrams page.
d4e9fc2 Add diagrams.

git-subtree-dir: docs_source
git-subtree-split: 04619c086a955d81dcf0fb15ebacca09d85787bf
Merge commit 'e6d9afd25aab2431e6e9e9d0a22f1fb010360188'
Updated docs.