Improve Examples section

[yusefnapora]

The current examples section just links to external sources for go, js and rust.

I think there's a big opportunity to take those external examples and rework them a bit, pull them into the site, and use them as teaching tools to walk people through libp2p use cases.

I think that keeping the examples in their own repos will probably work best, since that's the easiest place to keep them up-to-date and integrated with CI.

My tentative plan is to clone the example repos as part of the build process for this site, run them through some formatting, and embed the result into the site.

For this to work well, some work needs to be done on the example repos so that they all have enough narrative & framing around them, and I need to develop the formatting / build process.

[tristanisham]

@yusefnapora I created a pull for the Go getting started example. In its current state, it won't compile. There's no mention of the necessary declaration of ctx as seen in the last two code snippets of the document.

 // The context governs the lifetime of the libp2p node.
// Cancelling it will stop the the host.
ctx, cancel := context.WithCancel(context.Background())
defer cancel()

[p-shahi]

Reach out to other implementations (Python, Nim, Zig, etc) to be included in examples page. Will close the child tickets in favor of this one. @DannyS03 plans to combine the Tutorials and Examples section in the future, so some of this work will be addressed by that.