Make example workable

[leogermani]

Two small changes to the Getting Started example to make sure it works out of the box.

As of now, if you copy and paste the example you get 2 errrors:

1. You are prompted to register the abilities category first
2. when you call execute() you get an error because it's expecting an input.

Not sure if that was intentional, but I do think it's valuable to have an example that just works in this section.

[github-actions]

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Co-authored-by: leogermani <leogermani@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 22.52%. Comparing base (5f64910) to head (be6b9aa).

Additional details and impacted files

@@              Coverage Diff              @@
##              trunk     #156       +/-   ##
=============================================
- Coverage     80.46%   22.52%   -57.94%     
  Complexity      178      178               
=============================================
  Files            20       20               
  Lines          1474     1474               
  Branches        120      119        -1     
=============================================
- Hits           1186      332      -854     
- Misses          288     1142      +854     

Flag	Coverage Δ
javascript	94.61% <ø> (ø)
unit	1.40% <ø> (-74.92%)	⬇️

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