Change name of NIMIUS -> land in sicht (#48)

Author: j6s

src/data.yml

@@ -14,9 +14,9 @@ sponsors:
   - name: Haufe Group
     url: 'http://work.haufegroup.io/'
     image: images/haufe.png
-  - name: Nimius
-    url: 'https://nimius.net/'
-    image: images/nimius.svg
+  - name: land in sicht
+    url: 'https://www.land-in-sicht.de/'
+    image: images/land-in-sicht.svg
 team:
   - name: Nico
     url: http://www.ndh-websolutions.de/