Update 03-feature-branch.md

Remove the diagram associated with cloning a repo as it is too complicated and not quite correct now for our lesson compared to the original swc context.

episodes/03-feature-branch.md

@@ -41,8 +41,6 @@ $ git clone [email protected]:metoffice/git-training-demo.git
 
 Make sure to navigate to the `Desktop` folder first.
 
-![](fig/github-collaboration.svg){alt='A diagram showing that "git clone" can create a copy of a remote GitHub repository, allowing a second person to create their own local repository that they can make changes to.'}
-
 ## Feature Branches
 
 You can now make changes to the `git-training-demo` repository