Add number class annotation feature to HTML to Markdown conversion (#74)

This update introduces the `annotateNumberClasses` option, which, when
enabled, appends the CSS class name of number-bearing elements next to
the number in the markdown output. This preserves semantic meaning for
numbers, such as prices and ratings, while ensuring that nested numeric
parts do not add noise. The feature is accompanied by tests to verify
its functionality and is documented in the README.

Remove jsdom override (#71)

No longer needed since override can be done elsewhere

Remove xpath dependency and add jsdom overrides for cssstyle version … (

#70)

…in package.json

```
	ERROR	error extracting main html Error [ERR_REQUIRE_ESM]: require() of ES Module /var/task/node_modules/@csstools/css-calc/dist/index.mjs from /var/task/node_modules/@asamuzakjp/css-color/dist/cjs/index.cjs not supported.
Instead change the require of /var/task/node_modules/@csstools/css-calc/dist/index.mjs to a dynamic import() which is available in all CommonJS modules.
    at Object.<anonymous> (/var/task/node_modules/@asamuzakjp/css-color/dist/cjs/index.cjs:30:24) {
  code: 'ERR_REQUIRE_ESM'
}
```

jsdom 24 specifies cssstyle: "^4.0.1", and npm resolved it to 4.6.0
which pulls in the ESM chain. The ^ semver range let the bad version
slip in. This happens both locally and in prod.

The fix is to add an npm override to pin cssstyle to ~4.1.0 (the last
version before @asamuzakjp/css-color was added in 4.2.0):

Refactor jsdom import in extractMainHtml function for compatibility (#69

)

Replace xmldom with jsdom (#68)

Replace xmldom which has critical vulnerability.

`
xmldom  *
Severity: critical
xmldom allows multiple root nodes in a DOM -
GHSA-crh6-fp67-6883
Misinterpretation of malicious XML input -
GHSA-5fg8-2547-mr8q
xmldom: XML injection via unsafe CDATA serialization allows
attacker-controlled markup insertion -
GHSA-wh4c-j3r5-mjhp
`

The jsdom 24.x pin is because jsdom 25+ pulls in ESM-only transitive
dependencies (@csstools/*, parse5 v8) that break Jest's CommonJS module
resolution. When the project eventually moves to an ESM-native test
runner or Jest adds better ESM support, you can upgrade to jsdom 27.x.

init

Release version 0.4.0

Release version 0.3.2

Release version 0.3.1

Bump version to 0.3.0