Merge branch 'motivation/collab' into 'master'

adds funny collaboration image

See merge request sc/edu/git-seminar!3

basics.html

@@ -219,6 +219,17 @@
                 ```
           </section>
 
+          <section id="motivation-collaboration-3" data-markdown>
+            ## motivation #3
+
+            ![typo-pr](https://pbs.twimg.com/media/EDsklbLUEAMdusJ.png)
+
+            notes:
+            - might not seem like much
+            - but you are still making the world a better place
+            - and it is not too much effort
+          </section>
+
           <section id="motivation-creative-use" data-markdown>
             ## motivation #4
             ### the creative use award