Smarter autofix for rules which accommodates for tag-self-close rule.

[coliff]

This pull request introduces smarter autofix behavior for HTMLHint rules, specifically making autofixes aware of the tag-self-close rule. This ensures that generated <meta> tags will be self-closed if the rule is enabled, improving standards compliance and consistency with user configuration. The update also includes a new utility for determining if a rule is enabled for a given document, minor code cleanups, and version/documentation updates.

Autofix improvements

• Autofix logic for inserting <meta> tags (charset, viewport, description) now respects the tag-self-close rule, generating self-closing tags if enabled. (htmlhint-server/src/server.ts) [1] [2] [3]
• Added isHtmlHintRuleEnabled and isRuleEnabledForDocument helpers to robustly determine if a rule (like tag-self-close) is enabled for a given document. (htmlhint-server/src/server.ts)

Code maintenance

• Minor formatting and code cleanup in the createAttrValueNoDuplicationFix function. (htmlhint-server/src/server.ts) [1] [2] [3]

Version and documentation updates

• Bumped extension version to 1.15.0 and documented new autofix behavior in CHANGELOG.md. (htmlhint/package.json, htmlhint/package-lock.json, htmlhint/CHANGELOG.md) [1] [2] [3]
• Updated project homepage and development dependency (prettier) version in package.json. (package.json) [1] [2]