MNT print narx to markdown table

[MatthewSZhang]

Checklist

• Used a personal fork to propose changes
• A reference to a related issue: MNT print_narx outputs table in markdown format #132
• A description of the changes: print NARX model as markdown table

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (84b2f83) to head (9a646e2).
⚠️ Report is 75 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #133   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         9    +3     
  Lines          603       647   +44     
=========================================
+ Hits           603       647   +44     

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[MatthewSZhang]

After opening codecov verbose, it is found the previous token length is wrong. CODECOV_TOKEN= was mistakenly pasted into the secrets.