Adding Documentation About Deploying to Elastic Beanstalk with Yarn

[chrisjones-tripletri]

When the yarn dependency was introduced, it made asset precompilation on elastic beanstalk fail, since elastic beanstalk does not have yarn installed by default. Added a sample .ebextensions file which installs yarn and resolves the dependency issue.

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This change is 

[coveralls]

Coverage remained the same at 97.919% when pulling 870303c on chrisjones-tripletri:elastic-beanstalk-yarn-docs into 7f04afd on shakacode:master.

[justin808]

tiny formatting suggestion

LOOKS GREAT! Thanks!

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Reviewed 2 of 2 files at r1.
Review status: all files reviewed at latest revision, 2 unresolved discussions.

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docs/additional-reading/elastic-beanstalk.md, line 3 at r1 (raw file):

# Deploying React on Rails to Elastic Beanstalk

In order to deploy a React on Rails app to elastic beanstalk, you must install yarn on each instance.  

trailing whitespace.

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docs/additional-reading/elastic-beanstalk.md, line 26 at r1 (raw file):

    command: 'sudo wget https://dl.yarnpkg.com/rpm/yarn.repo -O /etc/yum.repos.d/yarn.repo'

let's use one blank line between sections

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Comments from Reviewable

[coveralls]

Coverage remained the same at 97.919% when pulling 94c0227 on chrisjones-tripletri:elastic-beanstalk-yarn-docs into 7f04afd on shakacode:master.

[justin808]

Thanks @chrisjones-tripletri!

[josephecombs]

Awesome PR, thanks for adding this! I will mention that I had to do the things mentioned here to get this solution to work AFTER adding the .ebextension mentioned in this PR:

http://tech.nickserra.com/2016/11/15/npm-install-error-eacces-permission-denied-mkdir-homewebapp/

[justin808]

@josephecombs Any chance that you can summarize what you need in a PR to the doc that @chrisjones-tripletri added?

[josephecombs]

yes, doing this now

[kkak10]

why make folder /home/webapp ?