Remove ❯ from code-blocks to make copy-pasted code runnable

[gnikit]

I think that the fenced code-blocks in the docs might need to have the ❯ character removed, since copy-pasting the block results into the ❯ character being copied as well thus making the command unable to run upon paste

[awvwgk]

We can just exclude the prompt: https://sphinx-copybutton.readthedocs.io/en/latest/use.html#strip-and-configure-input-prompts-for-code-cells

[gnikit]

Ty @awvwgk