Deploy the website even if other tests fail
Deploy the website even if other tests fail

Summary:
Circle only runs the commands under "deployment" if all tests pass. As a result, website deploys tend to get blocked unnecessarily when Circle is red, even when the website has no issues.

As every command under "overrride" is run independently even if other commands fail, the result of this PR is that the website will be deployed on every Circle run on `master` or any of the `-stable` branches.

Note that the "deployment" section is only executed when Circle is run against the master/-stable branch, and Circle is configured to not run deployments on forks. Since "override" does not have these protections in place, I've added some guards to ensure that a web deploy only occurs on runs triggered by commits to master/-stable on the main `facebook/react-native` repo.

This PR assumes the following are correct:

- `CI_PULL_REQUEST` and `CIRCLE_PR_USERNAME` are only set when [run on a fork](https://circleci.com/docs/1.0/environment-variables/#building-pull-requests-that-come-from-forks).
- `CIRCLE_PROJECT_USERNAME ` is only set to "facebook" when the run is triggered by a commit on the main `facebook/react-native` repo, and not a fork.

* Configuring circle.yml: https://circleci.com/docs/1.0/configuration/
* Environment Variables: https://circleci.com/docs/1.0/environment-variables/

None, aside from checking that bash can handle these conditionals. We need to trial this on Circle. Great attention needs to be paid to the conditionals, to ensure we do not allow forks to deploy the official website. We also need to make sure we are not leaking the GitHub access token accidentally.
Closes https://github.com/facebook/react-native/pull/14310

Differential Revision: D5179748

Pulled By: hramos

fbshipit-source-id: 405963f7e3bf2c1969e3e9a282781ce72c04e2d7

ptmt/react-native-macos,Livyli/react-native,skevy/react-native,arthuralee/react-native,PlexChat/react-native,hammerandchisel/react-native,tszajna0/react-native,pandiaraj44/react-native,Guardiannw/react-native,exponentjs/react-native,dikaiosune/react-native,myntra/react-native,Bhullnatik/react-native,brentvatne/react-native,farazs/react-native,cdlewis/react-native,myntra/react-native,doochik/react-native,negativetwelve/react-native,hoastoolshop/react-native,negativetwelve/react-native,formatlos/react-native,brentvatne/react-native,peterp/react-native,myntra/react-native,makadaw/react-native,cpunion/react-native,skevy/react-native,rickbeerendonk/react-native,cdlewis/react-native,hoastoolshop/react-native,forcedotcom/react-native,cpunion/react-native,myntra/react-native,cdlewis/react-native,hoastoolshop/react-native,rickbeerendonk/react-native,facebook/react-native,rickbeerendonk/react-native,kesha-antonov/react-native,Bhullnatik/react-native,exponent/react-native,Livyli/react-native,hammerandchisel/react-native,forcedotcom/react-native,hoastoolshop/react-native,myntra/react-native,tszajna0/react-native,ptmt/react-native-macos,Ehesp/react-native,hoastoolshop/react-native,skevy/react-native,pandiaraj44/react-native,pandiaraj44/react-native,forcedotcom/react-native,gilesvangruisen/react-native,Livyli/react-native,forcedotcom/react-native,hammerandchisel/react-native,cdlewis/react-native,PlexChat/react-native,dikaiosune/react-native,frantic/react-native,myntra/react-native,Guardiannw/react-native,exponentjs/react-native,Livyli/react-native,PlexChat/react-native,hammerandchisel/react-native,cdlewis/react-native,Bhullnatik/react-native,ptmt/react-native-macos,mironiasty/react-native,brentvatne/react-native,cpunion/react-native,pandiaraj44/react-native,kesha-antonov/react-native,brentvatne/react-native,PlexChat/react-native,forcedotcom/react-native,skevy/react-native,tszajna0/react-native,javache/react-native,Guardiannw/react-native,arthuralee/react-native,ptmt/react-native-macos,makadaw/react-native,Livyli/react-native,exponentjs/react-native,exponentjs/react-native,hoangpham95/react-native,ptmt/react-native-macos,thotegowda/react-native,hoangpham95/react-native,farazs/react-native,forcedotcom/react-native,makadaw/react-native,cpunion/react-native,doochik/react-native,rickbeerendonk/react-native,doochik/react-native,hoangpham95/react-native,janicduplessis/react-native,skevy/react-native,dikaiosune/react-native,brentvatne/react-native,mironiasty/react-native,thotegowda/react-native,mironiasty/react-native,hammerandchisel/react-native,frantic/react-native,negativetwelve/react-native,kesha-antonov/react-native,gilesvangruisen/react-native,exponent/react-native,PlexChat/react-native,mironiasty/react-native,rickbeerendonk/react-native,peterp/react-native,doochik/react-native,hoangpham95/react-native,negativetwelve/react-native,PlexChat/react-native,exponentjs/react-native,negativetwelve/react-native,farazs/react-native,doochik/react-native,gilesvangruisen/react-native,Bhullnatik/react-native,skevy/react-native,peterp/react-native,thotegowda/react-native,Guardiannw/react-native,gilesvangruisen/react-native,jevakallio/react-native,jevakallio/react-native,doochik/react-native,dikaiosune/react-native,kesha-antonov/react-native,formatlos/react-native,doochik/react-native,exponentjs/react-native,makadaw/react-native,formatlos/react-native,janicduplessis/react-native,Ehesp/react-native,exponent/react-native,Guardiannw/react-native,frantic/react-native,PlexChat/react-native,pandiaraj44/react-native,kesha-antonov/react-native,rickbeerendonk/react-native,jevakallio/react-native,formatlos/react-native,Guardiannw/react-native,exponentjs/react-native,forcedotcom/react-native,makadaw/react-native,jevakallio/react-native,Ehesp/react-native,kesha-antonov/react-native,negativetwelve/react-native,Ehesp/react-native,facebook/react-native,kesha-antonov/react-native,javache/react-native,peterp/react-native,exponent/react-native,farazs/react-native,cdlewis/react-native,Ehesp/react-native,peterp/react-native,mironiasty/react-native,shrutic123/react-native,Bhullnatik/react-native,Guardiannw/react-native,Ehesp/react-native,formatlos/react-native,mironiasty/react-native,javache/react-native,cdlewis/react-native,janicduplessis/react-native,formatlos/react-native,javache/react-native,javache/react-native,cpunion/react-native,hammerandchisel/react-native,thotegowda/react-native,rickbeerendonk/react-native,kesha-antonov/react-native,jevakallio/react-native,gilesvangruisen/react-native,mironiasty/react-native,arthuralee/react-native,facebook/react-native,hoastoolshop/react-native,facebook/react-native,shrutic123/react-native,facebook/react-native,dikaiosune/react-native,jevakallio/react-native,frantic/react-native,javache/react-native,Bhullnatik/react-native,shrutic123/react-native,formatlos/react-native,cpunion/react-native,exponentjs/react-native,makadaw/react-native,peterp/react-native,Livyli/react-native,exponent/react-native,hoangpham95/react-na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