According to Prof. Papadimitriou, the pdf we were linking to (as well as others on the internet) are not authorized by the current copyright owner, McGraw Hill.

Add link to free ebook for Node.js in Bahasa Indonesia

Removed Python Algorithms (PDF): Invalid Link

Removed the following link:
* [Python Algorithms](http://kysmykseka.net/koti/wizardry/Programming/Python/Apress%20-%20Python%20Algorithms%20Mastering%20Basic%20Algorithms%20in%20the%20Python%20Language.pdf) (PDF)

PowerShell Community Books

Fix some 404s

hhttps -> https

Add free, beginner focused books from Launch School

Change links to comply with author request

Agile Android Software Development download doesn't need an email reg…

Ian Parberry, the author, requests that links point to a license page
leading to his books rather than directly to pdf. See
https://github.com/vhf/free-programming-books/issues/1769#issuecomment-1
70046046

Add Android Note.

C++ Annotations book was moved to new host

The old one on SourceForge is not used anymore.

This fixes some 404s by removing them or changing the link if it's moved to a new location or avaliable elsewhere