Yann Pringault 8a8f34ae10 Improve dark mode for debugger
Summary:
* Added a label so we can click on the text to toggle the dark mode
* Added `height: 100%` in the CSS to make the dark background fill the entire view
* Improving JS code with `classList.toggle()` instead of redundant `if else` and fragile `document.styleSheets` access
* Adjusted the link color in dark mode to be less flashy

![image](https://cloud.githubusercontent.com/assets/5436545/24155304/bb80bb9a-0e53-11e7-9298-ce2c1ec6672c.png)

![image](https://cloud.githubusercontent.com/assets/5436545/24155311/c27e85f8-0e53-11e7-87ae-0245f54870c5.png)
Closes https://github.com/facebook/react-native/pull/13052

Differential Revision: D4748893

fbshipit-source-id: a81266c52b24f8e5dcedf0b9f37134688342d8d2
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