0.1 of the Disaster Recovery Section

Work in progress
Update disaster_recovery.rst
Updated to match @miketheman's feedback

Corrections have been made to comply with the style guide. Also added a bit of explanation about why preparation and planning are key-aspects of Disaster Recovery.
Added myself to the list aswell
Additional updates

Additional updates to comply with @MikeTheMan's feedback.
Edited.
Merge pull request #219 from modermodem/patch-1

Added some basic Disaster Recovery-information