chore: clean up examples/alice_http_client

[techouse]

• drop web example
• drop windows example
• drop linux example
• drop macos example

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This PR re-applies the changes made in 29a71db as a PR

[jhomlala]

I'm back with question:

Why we're dropping support for desktop? The goal is to have support for all platforms, except web where it's easy to use build in inspector.

[techouse]

Does it make much sense? I think it's overkill as an example.

[jhomlala]

Sure, but let's imagine scenario where you're manual tester and you don't have an access to the code and want to share information about calls from some desktop application which you're testing.

[techouse]

Besides, it probably doesn't work because

So what's the point?

[jhomlala]

Yeah I know, it's because of the dependencies that we're using - pub.dev analyzer (pana) is really restrictive. Anyway at this moment we know that Alice works fine on mobile, but ultimate goal is to support other platforms too. Web doesn't make any sense - there are build in inspector tools in web browsers. But for desktop, we could have support without doing huge changes.
At this moment it's okay to remove unsupported platforms from examples, but at the end we will revert it in some point in the future.

[techouse]

Ok, if that's the ultimate goal, then we add them back in the examples in the future.