Re-organized settings sections

Broke settings out into two sections. One is for post/page options, and
one is for admin options.
Updated options call

Updated options call to reflect new settings structure.
Updated screenshot

Updated the screenshot to reflect the new settings and organization.
Added support for rel="nofollow"

Added code to add rel=“nofollow” to all links in user bio entries when
enabled in plugin settings.
Fixed options naming

Fixed the naming of options to match new structure.