Merge pull request #129 from notdior/2.2

2.2
Adding a section about guides to the docs landing page.

This includes some language about themes.

Closes #131.
Merge branch '2.2' of github.com:pyrocms/pyrocms-docs into 2.2
Adding update on page types.

This needs for docs for page types, but this
at least gets rid of page layouts references.

Closes #123.
Rounding out the streams guide.

Closes #121.
Updating the pro docs with a link to pro on the store.
Fixing theme index page sub nav.
Updating the read me to reflect recent changes.
Updating pages plugin examples.

{{ body }} was being shown outside the
{{ custom_fields }} tags.
Adding a Troubleshooting section for some
common problems.
Merge remote-tracking branch 'upstream/2.2' into 2.2
not really sure what changed in this file right now.  Horrible I know but ping ping development so yea...