Update readme with content pipeline information

[KaneFreeman]

Description

Update the readme with information about the content pipeline. Not all of this is accurate until #41 get merged.

Code

This PR touches:

• Content
• Frontend
• Infrastructure
• Integration Tests

Tests

• Tests are included?

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[codecov]

Codecov Report

Merging #44 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #44   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          24     24           
  Lines         280    280           
  Branches       22     22           
=====================================
  Hits          280    280

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