Center screenshots and fix links

Author: sharkwouter

index.md

@@ -19,10 +19,10 @@ An open source toolchain for PlayStation Portable (PSP) development. It allows y
 Want to install the PSPDEV toolchain? [Go here](installation.html).
 {: .fs-5 }
 
-Want to get started, but don't what to build? [Go here](installation.html).
+Want to get started, but don't what to build? [Go here](basic_programs.html).
 {: .fs-5 }
 
-Your code is not working? [Go here](installation.html).
+Your code is not working? [Go here](debugging.html).
 {: .fs-5 }
 
 Need some in-depth knowledge? [Go here](documentation.html).
@@ -41,9 +41,12 @@ If you need help or would like to contribute, don't hesitate to join us on [Disc
 {: .fs-6 .fw-700 }
 
 [![nzportable screenshot](images/nzp.png)](https://github.com/nzp-team/nzportable)
-
+{: .text-center }
 [![oceanpop screenshot](images/oceanpop.png)](https://github.com/sharkwouter/oceanpop)
+{: .text-center }
 
 [![ccleste screenshot](images/ccleste.png)](https://github.com/fjtrujy/ccleste/tree/psp-fixes)
+{: .text-center }
 
 And so much more!
+{: .text-center }