The correct links for podcasts are added.

Fix wrongly indented bullet point

Just a small typo/error I found while reading through the list.

replace unrelated party link with internet archive link

Judgement call. This is a 3Com "white paper". Though 3Com has copyright, white papers are typically freely distributed to advance a technology. It doesn't appear as if Prof. Ricci has anything to do with the white paper. The ooriginal link was likely lost on 3com's acquisition. I suggest replacing it with https://web.archive.org/web/20080401000000*/http://www.3com.com/other/pdfs/infra/corpinfo/en_US/501302.pdf
because if the owner wants to remove it they can do so.

Update free-programming-books-ko.md

removed "Algorithms" (DP+V)

Added two new titles to the Mathematics category.

Add SOS operating system link (http://sos.enix.org/fr/SOSDownload)

[ID] Update: New MongoDB link

add "Programming OpenResty" to section "OpenResty"

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.

Added:

Basic Algebra, Digital Second Edition (Anthony W. Knapp)
Advanced Algebra, Digital Second Edition (Anthony W. Knapp)

A book about an Nginx-based web development platform called OpenResty.

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)