New hosting for Urs Liska's Scheme WIP book

[Jean Abou Samra]

Hi,

There used to be a WIP book on Scheme in LilyPond by Urs
at https://scheme-book.ursliska.de/introduction/index.html
This link appears to be dead now. The sources are still
available on the repository at
https://github.com/uliska/lilyponds-scheme
so I've hastily forked this and made the build result
available through Read the Docs:

https://scheme-book.readthedocs.io/en/latest/

If you had bookmarked this book, save this new URL.

My goal was to make this valuable content available again
on the short term. On the long term, I don't know if I'll
edit it; I'll probably rather make updates to my own Scheme tutorial
(https://scheme-tutorial.readthedocs.io), which also has
a French version. Mine is quite more concise though. I don't know
if that's a good thing or if I should make it more verbose and
slow-paced. If you have thoughts on the best path towards making
it easy for people to learn Scheme, with these two resources
as a starting point, feel free to express them.

Best,
Jean

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