feat: add helper function for enhance preview app

[elevatebart]

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[changeset-bot]

🦋 Changeset detected

Latest commit: cfcb434

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
vue-inbrowser-compiler-demi	Patch
vue-inbrowser-compiler-utils	Patch
vue-inbrowser-compiler	Patch
vue-styleguidist	Patch

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[codecov]

Codecov Report

Merging #1387 (cfcb434) into dev (fa559df) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1387   +/-   ##
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  Coverage   88.41%   88.41%           
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  Files         114      114           
  Lines        8540     8540           
  Branches     1177     1177           
=======================================
  Hits         7551     7551           
  Misses        955      955           
  Partials       34       34           

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[elevatebart]

@didagu this is the PR that adds the defineEnhanceApp() function and its docs