* Update "How to Think Like a Computer Scientist: Learning with Python" and "Think Python"
* "How to Think Like a Computer Scientist: Learning with Python":
* Fix obsolete links: update URI 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.
* Update "How to Think Like a Computer Scientist: Learning with Python" and "Think Python"
* Rearrange the links to meet the Formatting Guidelines.
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