Added Google Analytics to docs

[Roach]

Summary

Added Google Analytics to docs

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #449 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #449   +/-   ##
======================================
  Coverage    89.1%   89.1%           
======================================
  Files          44      44           
  Lines        1258    1258           
  Branches      190     190           
======================================
  Hits         1121    1121           
  Misses        137     137

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 68602f5...e557f27. Read the comment docs.