Support HTML minification with htmlnano

[edoardocavazza]

This PR adds support for HTML minification through the htmlnano module. Please note that htmlnano is not bundled with the plugin, users will need to install the dependency themselves in order to enable HTML minification.

It should fix #158.

[changeset-bot]

🦋 Changeset detected

Latest commit: 550fdcb

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

This PR includes changesets to release 1 package

Name	Type
@chialab/esbuild-plugin-html	Patch

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[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 91.54%. Comparing base (d745e14) to head (550fdcb).

Files	Patch %	Lines
packages/esbuild-plugin-html/lib/index.js	73.33%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
- Coverage   91.64%   91.54%   -0.10%     
==========================================
  Files          36       36              
  Lines        5865     5892      +27     
==========================================
+ Hits         5375     5394      +19     
- Misses        490      498       +8     

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