Update index.md

Author: yochannah

index.md

@@ -2,7 +2,7 @@
 
 Through working with scientific code, we agree that scientific code needs to be treated as a genuine research output.
 
-## Preamble: 
+## Preamble
 Code is science. Historically, science has been reviewed by its peers to validate it before being published. In modern times, computer code forms part of scientific analysis, but it is rarely shared and reviewed. 
 
 This manifesto is for anyone who deals with code in a scientific setting, including publishers, researchers, engineers, and administrators. 
@@ -22,6 +22,6 @@ Be nice and provide constructive criticism, when reviewing recognise that people
 Software should be cited and acknowledged as scientific output. This means you should cite your sources as well as ask to be cited yourself. 
 
 ## Background
-- Agile Manifesto
-- Data Ops Manifesto
-- Software Sustainability Institute Collaboration Workshop 2018
+- [Agile Manifesto](http://agilemanifesto.org/)
+- [Data Ops Manifesto](http://dataopsmanifesto.org/)
+- [Software Sustainability Institute Collaboration Workshop 2018](https://www.software.ac.uk/cw18/)