chore: adding htmlPlugin eslint parser

[DianaSuvorova]

Hi,

This is a fairly large change — happy to break it into smaller PRs if preferred.

This PR introduces HTML linting using @html-eslint, which covers formatting, accessibility (a11y), and semantic HTML rules.

The changes here are the result of running npm run lint --fix. There are still a few issues that weren't auto-fixed — I've included them below for visibility.

If this direction looks good, I’d be happy to:

• follow up with manual fixes for the remaining issues,
• set up a GitHub Action to run lint checks on PRs,
• and potentially add more plugins like Tailwind and Alpine.js support.

Looking forward to your feedback!

dianasuvorova@mac pines % npm run lint

> [email protected] lint
> eslint **/*.html --fix


/Users/dianasuvorova/Dev/pines/elements/card.html
  3:9  error  Missing `alt` attribute at `<img>` tag  @html-eslint/require-img-alt

/Users/dianasuvorova/Dev/pines/elements/combobox.html
  97:13  error  Invalid container of `<li>`. <li>` should be in `<ul>`, `<ol>` or `<menu>`  @html-eslint/require-li-container

/Users/dianasuvorova/Dev/pines/elements/copy-to-clipboard.html
  23:13  error  The attribute 'class' is duplicated  @html-eslint/no-duplicate-attrs

/Users/dianasuvorova/Dev/pines/elements/dropdown-menu.html
  7:9  error  Missing `alt` attribute at `<img>` tag  @html-eslint/require-img-alt

/Users/dianasuvorova/Dev/pines/elements/full-screen-modal.html
  69:17  error  Missing `alt` attribute at `<img>` tag  @html-eslint/require-img-alt

/Users/dianasuvorova/Dev/pines/elements/image-gallery.html
  80:17  error  Invalid container of `<li>`. <li>` should be in `<ul>`, `<ol>` or `<menu>`  @html-eslint/require-li-container
  81:21  error  Missing `alt` attribute at `<img>` tag                                      @html-eslint/require-img-alt

/Users/dianasuvorova/Dev/pines/elements/rating.html
  46:17  error  Invalid container of `<li>`. <li>` should be in `<ul>`, `<ol>` or `<menu>`  @html-eslint/require-li-container

/Users/dianasuvorova/Dev/pines/elements/select.html
  200:13  error  Invalid container of `<li>`. <li>` should be in `<ul>`, `<ol>` or `<menu>`  @html-eslint/require-li-container

/Users/dianasuvorova/Dev/pines/elements/sticky-header.html
  48:5  error  The attribute 'x-data' is duplicated  @html-eslint/no-duplicate-attrs

/Users/dianasuvorova/Dev/pines/elements/toast.html
  441:17  error  Invalid container of `<li>`. <li>` should be in `<ul>`, `<ol>` or `<menu>`  @html-eslint/require-li-container

/Users/dianasuvorova/Dev/pines/getting-started/alpine-plugin.html
   5:1  error  Missing closing tag for p  @html-eslint/require-closing-tags
  17:5  error  Missing closing tag for p  @html-eslint/require-closing-tags

/Users/dianasuvorova/Dev/pines/getting-started/introduction.html
  96:21  error  The attribute 'class' is duplicated  @html-eslint/no-duplicate-attrs