Update links to blog repository

_config.yml

@@ -30,7 +30,7 @@ author:
 # Custom vars
 version:             1.0.0
 github:
-  repo:              https://github.com/phil-opp/phil-opp.github.io
+  repo:              https://github.com/phil-opp/blog_os
 
 # Navigation
 navigation_pages:

_posts/2015-08-18-multiboot-kernel.md

@@ -7,7 +7,7 @@ This post explains how to create a minimal x86 operating system kernel. In fact,
 I tried to explain everything in detail and to keep the code as simple as possible. If you have any questions, suggestions or other issues, please leave a comment or [create an issue] on Github. The source code is available in a [repository][source code], too.
 
 [Rust]: http://www.rust-lang.org/
-[create an issue]: https://github.com/phil-opp/phil-opp.github.io/issues
+[create an issue]: https://github.com/phil-opp/blog_os/issues
 [source code]: https://github.com/phil-opp/blog_os/tree/multiboot_bootstrap/src/arch/x86_64
 
 ## Overview

_posts/2015-08-25-entering-longmode.md

@@ -11,7 +11,7 @@ I tried to explain everything in detail and to keep the code as simple as possib
 [Rust]: http://www.rust-lang.org/
 [protected mode]: https://en.wikipedia.org/wiki/Protected_mode
 [long mode]: https://en.wikipedia.org/wiki/Long_mode
-[create an issue]: https://github.com/phil-opp/phil-opp.github.io/issues
+[create an issue]: https://github.com/phil-opp/blog_os/issues
 [source code]: https://github.com/phil-opp/blog_os/tree/entering_longmode/src/arch/x86_64
 
 _Notable Changes_: We don't use 1GiB pages anymore, since they have [compatibility problems][1GiB page problems]. The identity mapping is now done through 2MiB pages.

_posts/2015-09-02-setup-rust.md

@@ -9,7 +9,7 @@ This blog post tries to setup Rust step-by-step and point out the different prob
 [multiboot post]: {{ site.url }}{{ page.previous.previous.url }}
 [long mode post]: {{ site.url }}{{ page.previous.url }}
 [Rust]: https://www.rust-lang.org/
-[file an issue]: https://github.com/phil-opp/phil-opp.github.io/issues
+[file an issue]: https://github.com/phil-opp/blog_os/issues
 [Github repository]: https://github.com/phil-opp/blog_os/tree/setup_rust
 
 ## Installing Rust

_posts/2015-10-23-printing-to-screen.md

@@ -11,7 +11,7 @@ In the [previous post] we switched from assembly to [Rust], a systems programmin
 
 This post uses recent unstable features, so you need an up-to-date nighly compiler. If you have any questions, problems, or suggestions please [file an issue] or create a comment at the bottom. The code from this post is also available on [Github][code repository].
 
-[file an issue]: https://github.com/phil-opp/phil-opp.github.io/issues
+[file an issue]: https://github.com/phil-opp/blog_os/issues
 [code repository]: https://github.com/phil-opp/blog_os/tree/printing_to_screen/src
 
 ## The VGA Text Buffer