Updates documentation (Improves #114)

[prasadtalasila]

• Adds developer documentation
• Updates user documentation
• Uses mermaid to integrate UML diagrams
  into the documentation.
• Uses npm madge to generate dependency graphs
  for source code.
• Corrects the markdown linter configuration to
  catch the warnings in markdown files.

[codeclimate]

The PR diff size of 6351 lines exceeds the maximum allowed for the inline comments feature.

[codeclimate]

Code Climate has analyzed commit 5d5980d and detected 562 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Style	562

View more on Code Climate.

[codecov-commenter]

Codecov Report

Merging #117 (5d5980d) into feature/distributed-demo (6e6b9f5) will increase coverage by 0.86%.
The diff coverage is n/a.

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@@                     Coverage Diff                      @@
##           feature/distributed-demo     #117      +/-   ##
============================================================
+ Coverage                     65.80%   66.66%   +0.86%     
============================================================
  Files                            35       42       +7     
  Lines                           424      537     +113     
  Branches                         27       31       +4     
============================================================
+ Hits                            279      358      +79     
- Misses                          129      160      +31     
- Partials                         16       19       +3     

see 7 files with indirect coverage changes

Components	Coverage Δ
Website	62.72% <ø> (ø)
Lib Microservice	69.91% <ø> (∅)