Update "How to Think Like a Computer Scientist: Learning with Python" & "Think Python"

[tunggnu]

What does this PR do?

Update "How to Think Like a Computer Scientist: Learning with Python" & "Think Python"

• "How to Think Like a Computer Scientist: Learning with Python":
  • Fix obsolete links: update URL and use HTTPS.
  • Add more editions to the title.
• "Think Python":
  • It diverges from "How to Think Like a Computer Scientist: Learning with Python" with many changes. So Allen B. Downey is the single author of this title.
  • Move it up one level and add the first edition.

For resources

How do we know it's really free?

• "How to Think Like a Computer Scientist: Learning with Python" is available under the GPL Free Documentation License.
• "Think Python" is available under the Creative Commons Attribution-NonCommercial 3.0 Unported License

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

They are two well-known books.

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)

Followup

• Check the output of Travis-CI for linter errors!

[tunggnu]

Please see my comment in #2353 (comment)

[eshellman]

This looks fine. More work than most to get it right, but the book is worth it.

An important function of the alphabetical order is that it helps us avoid duplicates.