Enable goerli deploy and remove deprecated testnets

[jdville03]

Proposed Changes

• update deploy setup to handle goerli as primary testnet
• remove deprecated testnets (rinkeby, ropsten, kovan)
• update verification script to verify identity contracts

[codecov[bot]]

Codecov Report

Merging #569 (fbb7bbf) into master (a718a13) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #569   +/-   ##
=======================================
  Coverage   90.64%   90.64%           
=======================================
  Files          54       54           
  Lines        2009     2009           
  Branches      459      459           
=======================================
  Hits         1821     1821           
  Misses        188      188           

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