[📖] Add a blog index page with all blog posts to the qwik city demo

Suggestion

It's not documentation per se but rather a change in the demo qwik city app.

When writing blogs with mdx, we need an index or category page to show blog post lists.

Problem

How to create such a page needs to be clarified, especially if you're unfamiliar with Vite's import.meta.glob. The current state may lead to uncertainty and wasted time, or even abandonment in the worst cases.

Resolution

Add a blog/index.ts with a few mdx blog posts that implement the import.meta.glob to the features section of the qwik city demo app.

Discussion

I would add:

1. Three three blog posts, two mdx, and one md
2. An index file that'll glob and order them by published date - not sure about how to implement this yet
3. A JSX component that will render in the mdx files.

Start in the features section of the Qwik City demo app and inspect the proposed blog/index.ts entry point. Review Vite's import.meta.glob documentation, then determine how the three MDX/MD posts should expose publication dates and how a JSX component will render them. Done means the demo includes an index listing the posts in published-date order and the posts render their component.