Add link for spectreconsole/wcwidth in intro.rst

[patriksvensson]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a753ba4) to head (c88e47a).
⚠️ Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #153   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          100       100           
  Branches        20        20           
=========================================
  Hits           100       100           

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