Refresh of Remote Debugging

High level changes:
- `<div id="screenshot">` --> `<figure>`
- `<div id="collapsible">` --> `<section>`
- other HTML cleanup
- changed any references to `about:chrome` to `chrome://inspect` (also, wrapped in bold tags instead of code tags)

For **remote-debugging.html**:
- many changes so best to actually preview the page instead of looking at diff
- cleaned up text to incorporate debugging Android WebViews better
- added new images/screenshots, clarified some screenshots with callouts, deleted unused screenshots
- created "Additional information about ADB" and "Remote debugging for DevTools extension developers" sections at bottom to move less viewed (my assumption) content out of the way




the kitkat 4.4 requirement isn't for all remote debugging. If we're saying this for webview i want to be clear on that.