fix: docs(ui/steps): use the setup script for exmple and docs

[hutututtt]

Checklist

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• Fix linting errors
• Tests have been added / updated (or snapshots)

Change information

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Name	Status	Preview	Updated
varlet	✅ Ready (Inspect)	Visit Preview	Apr 24, 2022 at 6:44AM (UTC)
varlet-ui-playground	✅ Ready (Inspect)	Visit Preview	Apr 24, 2022 at 6:44AM (UTC)

[codecov-commenter]

Codecov Report

Merging #505 (734c27c) into docs/script-setup (8a3eed9) will not change coverage.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           docs/script-setup     #505   +/-   ##
==================================================
  Coverage              96.42%   96.42%           
==================================================
  Files                    217      217           
  Lines                   5148     5148           
  Branches                 944      944           
==================================================
  Hits                    4964     4964           
  Misses                   184      184           

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