feat: use content collections for the blog

[burnmaniac]

Based on this X post, I've added Content Collections to the blog page of tanstack.com.

To summarize the change:

• Added Content Collections plugin to Vite
• Added Content Collections generated files to .gitignore
• Adjusted all published fields for articles to YYYY-MM-DD
• Adjusted fetchFrontMatters server function
• Removed getPostList utility function as, per my understanding, we don't need it anymore

Happy to hear feedback, as this is my small and first open-source contribution, and I've been really nervous before committing (had to fix stuff and force-push 4 times into my branch before opening PR).

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[burnmaniac]

Thank you for the feedback!

I’ve changed the date format mainly because of the schema validation, and because YYYY-MM-DD is generally recommended per ISO 8601. From my experience, the former format could create some issues. I think that change is reasonable.

I’m sorry about the bindings, I’ve never used Astro CC before, and I didn’t know there are Vite bindings as well.

I should have mentioned the alias cannot be changed; I tried.

[SeanCassiere]

@burnmaniac thank you for contributing this!

Also, congrats on your first open-source contribution!