Rename the examples directory

[ghost]

I'm considering renaming the examples directory to something else, perhaps demos. I find two things about the current setup inconvenient:

1. It's hard to add new examples because we need to add an [[example]] section per example to examples/Cargo.toml. I find this inconvenient because sometimes it's nice to add a quick temporary example for testing.

2. You need to be in the examples directory to run examples.

A possible solution to this would be to:

• rename examples to demo
• delete autoexamples = false
• add demo to default-members list in the [workspace] section
• perhaps change examples to bins

In that case, we could do cargo run --bin ctrl-c from the root of the repository.

[tshepang]

I can do this if you want... looks like easy way to contribute

[ghost]

@tshepang Go ahead! :)