Update listing for SICP book

[NeilsC]

What does this PR do?

Add info and fix broken link

For resources

Description

Why is this valuable (or not)?

It's a classic text in the field.

How do we know it's really free?

The work is CC licensed.

For book lists, is it a book? For course lists, is it a course? etc.

Book

Checklist:

• Read our contributing guidelines.
• Search for duplicates.
• Include author(s) and platform where appropriate.
• Put lists in alphabetical order, correct spacing.
• Add needed indications (PDF, access notes, under construction).
• Used an informative name for this pull request.

Follow-up

• Check the status of GitHub Actions and resolve any reported warnings!

[eshellman]

There's also https://sourceacademy.org/sicpjs/index which seems to be the authorized MITPress version

[NeilsC]

That's actually a distinct version using Javascript. Probably a good addition to the list, but I haven't read it.

[eshellman]

Thanks, and welcome to free-programming-books! SICP is THE book that people ask about when I mention free-programming-books, so it's very important that we keep our link up to date. I think we have versions for several programming languages and several written languages already.