Generate .d.ts file from the esm module (#2733)

[Alexerson]

Description

Generating the htmx.d.ts file from src/htmx.js means the export statements are not included in the types file. Because typescript users will always want to import the esm file, it makes more sense to generate the types file from the module.

Corresponding issue: #2733

Testing

After generating the new type definition, I copied the content of dist/ to my local project node_modules and the error disappears and the project builds properly.

Checklist

• I have read the contribution guidelines
• I have targeted this PR against the correct branch (master for website changes, dev for
  source changes)
• This is either a bugfix, a documentation update, or a new feature that has been explicitly
  approved via an issue
• I ran the test suite locally (npm run test) and verified that it succeeded