resized the images so they fit side-by-side.
- added some headings and collapsable sections
- added link in js-debugging to blackboxing
added some contextual info about blackboxing including link to doc
Merge github.com:GoogleChrome/devtools-docs into blackboxing

* github.com:GoogleChrome/devtools-docs:
  `contributing.md`: Fix link
changed blackbox id
Merge github.com:GoogleChrome/devtools-docs into blackboxing

* github.com:GoogleChrome/devtools-docs:
  Removed some limitations. Added Esc key tip.
  Added controls to videos.
  Fixed non-breaking hyphen HTML Entity.
  Fixed id for Simulate device orientation h3 tag.
  Update device-mode.html
  device-mode. update to new gfycats
  Changed h2 caps to sentence-style.
  Fine-tune writing edits and image compression.
  Fixed the code changes tracker RSS URL
  adding updated device mode files
  removing old device mode files
  Losslessly minify all images
made updates to blackbox
updates using hemingway
Merge pull request #183 from jaredwilli/blackboxing

Updates for blackboxing