Add Theme and Plugin Handbooks

[grappler]

I would like to make some changes to http://developer.wordpressorg.dev/plugins and http://developer.wordpressorg.dev/themes but they are not shown by default and is missing content.

• Which plugins are activated on https://developer.wordpress.org/themes/ https://developer.wordpress.org/plugins/? (Should they be activated via the initialization script or via active_plugins value in the database.
• Can we get a database export?