Updating the API docs to reflect current API iteration

[Phasmatrix]

• added devices rout and changed title
• added boilerplate files for nav bar
• adding device information
• changed GET for all devices
• added GET-ALL devices pages
• added POST device docs
• added GET of a single device
• Cleaned up listing of entities
• added POST for /trees
• GET all and POST for ConversionModels
• GET single ConversionModel
• fault checking
• added all the User requests and started with authentication
• added User auth to all POST requests

[Phasmatrix]

Still to do:

• [ ] Do some of the GET requests to certain routes need to be protected as well with a JWT? I'm thinking of the User routes and devices/sensor routes?
• [ ] styleguide warning issue still needs to be resolved, should be easy fix #156