make the README runnable in Livebook :)

[spencerolson]

No description provided.

[spencerolson]

took surprisingly few changes to get this working in Livebook! There is one thing I still can't figure out: with the final code code sample in the README i get

** (Mix.Error) Mix.install/2 can only be called with the same dependencies in the given VM
    (mix 1.15.7) lib/mix.ex:577: Mix.raise/2
    #cell:dy5ab6jj3lj5ooey:1: (file)

And I'm not sure of any way around that other than requiring all of those dependencies at the top in setup (and I felt that'd mess with the flow and intent of the README to have those all installed at the top).

[spencerolson]

Adds a "Run in Livebook" button.

The rest of the changes are minor changes to the code samples to make them work in Livebook.

[spencerolson]

Check it out in action!

livebook-demo.mp4

[wojtekmach]

This is a really nice idea! We cannot remove README.md though as it's rendered on GitHub which is important to me. How about we make any necessary changes to README.md and have a README.livemd which is the exact copy (we can have mix.exs keep them identical)?

** (Mix.Error) Mix.install/2 can only be called with the same dependencies in the given VM

Yeah not sure what to do about that either maybe we don't have an exact copy after all and we skip this section in the README.livemd.

[spencerolson]

Thanks!

We cannot remove README.md though as it's rendered on GitHub which is important to me.

I believe GitHub supports .livemd (relevant PR), for example see the livebook from my Weather repo: https://github.com/spencerolson/weather/blob/main/LIVEBOOK.livemd (I still need to convert my README to livemd in that repo too)