closes #238 - Display tutorial for Arango

[anthonykhoa]

The websites needs to display a tutorial, as well as all the ability to create a database for Arango.
This PR cannot be merged until we have a production arango database.
This PR will:

• Include a tutorial for Arango
• Update relevant back-end files needed to enable create my database button for on the Arango tutorial page
• Update tutorial to display an instead of a before database names that start with a vowel

[codecov]

Codecov Report

Merging #240 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #240   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          481       494   +13     
  Branches        50        55    +5     
=========================================
+ Hits           481       494   +13     

Impacted Files	Coverage Δ
database/arango/arango.js	100.00% <100.00%> (ø)
database/elasticsearch/elastic.js	100.00% <100.00%> (ø)
lib/util.js	100.00% <100.00%> (ø)
src/routes/renderRoutes.js	100.00% <100.00%> (ø)
src/routes/userRoutes.js	100.00% <100.00%> (ø)

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[Ulisseus]

Shouldn't it be process.env.HOST for postgres/sequelize and process.env.ES_HOST for elastic?

[anthonykhoa]

You are right -- I simply copy and pasted the links used for dbHost that the last person that touched this file used. It should be process.env.ES_HOST for elastic, and the testing files should change to reflect that too. Thank you, I will make those changes! We have to update our environment variables for postgres and elasticsearch on our CI in order for tests to pass.