docs: update site domain to v3.wails.io

[leaanthony]

Summary

• Updated astro.config.mjs site configuration from https://wails.io to https://v3.wails.io
• Fixes sitemap.xml generation and SEO for v3 documentation

Quality Checklist

• Domain updated in configuration
• No broken links or dependencies
• Proper commit message

Closes #LEA-12

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[github-actions]

⚠️ Missing Changelog Update

Hi @leaanthony, please update v3/UNRELEASED_CHANGELOG.md with a description of your changes.

This helps us keep track of changes for the next release.

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Deploying wails with    Cloudflare Pages

Latest commit:	ddd59cf
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[github-actions]

⚠️ Missing Changelog Update

Hi @leaanthony, please update v3/UNRELEASED_CHANGELOG.md with a description of your changes.

This helps us keep track of changes for the next release.