Uses generic derivation for reinterpret log example

[jkachmar]

The ReinterpretLog example had a comment mentioning that generic derivation of HFunctor and Effect for first-order effects wasn't possible at the time, and linked to an issue (#54) that has since been closed (#170).

This PR updates the example with a generic derivation for these effects and removes the comment, which is no longer applicable.

[jkachmar]

Funny thing is that I was originally going to try and create some fused-effects-th package to automatically gin up these instances + the helper functions (like polysemy does) when I looked at the Teletype example and realized that you'd already built-in a way nicer solution for the instances stuff 😂

[robrix]

This is wonderful. Thank you so much @jkachmar!