Add presentation for DACH epidemiological conference 2020.

.gitattributes

+documents/dach21/*.jpg filter=lfs diff=lfs merge=lfs -text
+documents/dach21/*.png filter=lfs diff=lfs merge=lfs -text
+documents/dach21/*.mp4 filter=lfs diff=lfs merge=lfs -text

.gitlab-ci.yml

@@ -77,6 +77,7 @@ document:
       - documents/parallel_simulation/parallel_simulation.pdf
       - documents/sampling_effects/sampling_effects.pdf
       - documents/foraging_parameters.pdf
+      - documents/dach21/dach21.pdf
 
 builder:
   when: manual