Fix links to Web/RTM API docs from README

[konklone]

Summary

Fixes some links in the README.

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

@@          Coverage Diff           @@
##           master    #444   +/-   ##
======================================
  Coverage    89.1%   89.1%           
======================================
  Files          44      44           
  Lines        1258    1258           
  Branches      190     190           
======================================
  Hits         1121    1121           
  Misses        137     137

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[aoberoi]

Thanks!