* Fixed broken links

* Fix: missed PDF notation

* Delete two links

* Update books/free-programming-books-subjects.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Update books/free-programming-books-subjects.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Update books/free-programming-books-subjects.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Updates - Thanks to @davorpa

* Fixed missing notation

* Update books/free-programming-books-subjects.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Recover working `School of Data Handbook`

* Use archived PDF to fix `Microservices AntiPatterns and Pitfalls` broken link

* fix: use and updated frontmatter to solve broken link

`Microservices vs. Service-Oriented Architecture` by Mark Richards

Moved HTML version: https://www.oreilly.com/radar/microservices-vs-service-oriented-architecture/
Archived PDF: https://web.archive.org/web/20201112010849/https://www.oreilly.com/programming/free/files/microservices-vs-service-oriented-architecture.pdf
Broken: https://www.oreilly.com/content/microservices-antipatterns-and-pitfalls/Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>