Improve Examples section about docs HOT 3 CLOSED

@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()

from docs.

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.

from docs.

After having touched on this issue (and idea) a few times in the latter half of 2022, the preference among the stewards is to keep the examples in their respective repos.

We also have a general "Guides" section now that provides guides to get started with libp2p, and it will continue to refer to the examples in each repo (for example, as mentioned here). Implementations that do not have a getting started guide will be added shortly.

As a result, let's close this and revisit if necessary.

from docs.