expand and re-order documentation index

[cgoldberg]

this PR enhances the docs by:

• expands the index page entries in the Documentation
• re-orders the index so changelog is after third party tools

expanding the index is a huge improvement (IMO).

[codecov]

Codecov Report

Merging #779 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #779   +/-   ##
=======================================
  Coverage   65.13%   65.13%           
=======================================
  Files          14       14           
  Lines        1417     1417           
  Branches      222      222           
=======================================
  Hits          923      923           
  Misses        443      443           
  Partials       51       51

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[aldenpeterson-wf]

👍