Add widget.json

[ajdapretnar]

Issue

Website requires widget.json to display docs.

Description of changes

Add widget.json.
File generated with:
python ~/orange/orange-hugo/scripts/create_widget_catalog.py --categories "Associate" --doc .

Association Rules added manually since script was somehow unable to find it.

Includes

• Code changes
• Tests
• Documentation

[codecov-io]

Codecov Report

Merging #30 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #30   +/-   ##
=======================================
  Coverage   16.74%   16.74%           
=======================================
  Files           3        3           
  Lines         221      221           
=======================================
  Hits           37       37           
  Misses        184      184

---

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 16.74%. Comparing base (d89c31c) to head (2608664).
⚠️ Report is 57 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #30   +/-   ##
=======================================
  Coverage   16.74%   16.74%           
=======================================
  Files           3        3           
  Lines         221      221           
=======================================
  Hits           37       37           
  Misses        184      184           

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