Deleted old unused images
updated several screenshots and annotated images
added alt tags to all images and removed TODO comments for each
Merge branch 'network' of https://github.com/jaredwilli/devtools-docs

* 'network' of https://github.com/jaredwilli/devtools-docs:
  Deleted old unused images updated several screenshots and annotated images added alt tags to all images and removed TODO comments for each

Jareds network changes