[Several] Updated overview pages (#5986)

* updated overview page to overview style

* refined text

* added zaraz overview

* refined text email routing

* added images overview page

* added warp
refined meta info position

* added warp

* added registrar

* added to registrar index

* finishing adding to registrar index

* added area 1 overview

* refined registrar text

* added railgun

* refined text

* corrected area 1 link

* corrected railgun link

* refined registrar text

* refined warp text

* refined images text

* refined zaraz text

* Fixed area 1 icon fill

* removed fill from CF1 icon

* Apply suggestions from code review

Co-authored-by: Kody Jackson <kody@cloudflare.com>

Co-authored-by: Kody Jackson <kody@cloudflare.com>