Add two older posts as use cases

Review here

Added two older posts as community use cases, overlooked them so far.

Related #205 (closed)

_posts/2020/04/2020-04-06-hifis-support-folding-at-home.md

 ---
 title: "Folding@Home and research on SARS-CoV-2"
-title_image: default
+title_image: omar-flores-MOO6k3RaiwE-unsplash.jpg
 date: 2020-04-09
 authors:
   - Konrad, Uwe (HZDR)
@@ -28,3 +28,18 @@ In a coordinated effort with the computing center of the
 Helmholtz-Zentrum Dresden - Rossendorf, free resources of the CASUS high
 performance computer and the HZDR high performance computer "Hemera" are being
 combined.
+
+#### Interested? Comments and Suggestions?
+
+If you are interested, please do not hesitate to contact us:
+
+<a href="{% link contact.md %}"
+                            class="btn btn-outline-secondary"
+                            title="HIFIS Helpdesk">
+                            Contact us! <i class="fas fa-envelope"></i></a>
+
+---
+
+#### Changelog
+
+- 2022-04-11 Added headline picture and contact information.