replaces google tracked badges with shields.io

[japrescott]

closes lig-5584

• replace google colab badges (which get blocked by most ad/tracking blockers) with img.shields

previously;

after;

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.22%. Comparing base (8a6685f) to head (7a1a31a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1745      +/-   ##
==========================================
- Coverage   85.31%   85.22%   -0.09%     
==========================================
  Files         162      162              
  Lines        6729     6729              
==========================================
- Hits         5741     5735       -6     
- Misses        988      994       +6     

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[guarin]

LGTM