Summary:Explain the **motivation** for making this change. What existing problem does the pull request solve?
> When vjeux [asked me how the documentation changes looked](https://github.com/facebook/react-native/pull/6423#issuecomment-195608638), it wasn't obvious to me how to build and view them locally. So, I thought it might be a good idea to add instructions to the contributing document.
I was able to run the website locally when working on PR #6423 but am no longer able to now. I have since updated my local repo with a `git pull`. I've deleted the node_modules directories in both the root and website folders, rebuilding both. Still, I get the following error when I run `npm start` within the website directory (problem with the ES2015 compiling?)...
```bash
**/react-native/website/server/convert.js:134
.filter(key => key.startsWith('RN_'))
^^
SyntaxError: Unexpected token =>
at exports.runInThisContext (vm.js:73:16)
at Module._compile (
Closes https://github.com/facebook/react-native/pull/6510
Differential Revision: D3070560
Pulled By: vjeux
fb-gh-sync-id: 6d200bb545d0ce357500cd666dd400ec82fafa92
shipit-source-id: 6d200bb545d0ce357500cd666dd400ec82fafa92
Summary:- Simplified the PR and Issue template to make them easier to read.
- Add a very simple guide for reviewing PRs (cc bestander, feel free to add to this)
Closes https://github.com/facebook/react-native/pull/6295
Differential Revision: D3011905
fb-gh-sync-id: 4929921690a6996e574e6b152a9dd41087cfffdc
shipit-source-id: 4929921690a6996e574e6b152a9dd41087cfffdc
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