remove link to async counter app from tutorials page

[joshka]

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[reillysiemens]

@joshka, out of curiosity, why was this example unlinked? I was in the middle of reading it, paused for a few weeks, and then saw the example disappeared from the main page. Was something wrong with it?

[kdheepak]

I requested @joshka to remove it. We intend for a new async tutorial to replace it and I personally didn't want to keep maintaining it / have people asking questions about it when I knew it was going to go away.

There's two things that need better tutorials imo:

1. The StatefulWidget pattern from crates-tui - https://github.com/ratatui-org/crates-tui. I started that PR here: feat: crates-tui based async tutorial #440
2. Different ways to use async with ratatui.

You can look through the source code of crates-tui for one of the ways to use async with ratatui but there's just a lot to cover there and probably needs to be fleshed out in more tutorials or material on the website.

[reillysiemens]

Fair enough. Thanks for the extra context, @kdheepak. I appreciate it. 😁

[kdheepak]

Thanks for understanding! fwiw, the content is still on the website, it's just very annoying to get to without the sidebar links.