Create a post announcing and explaining Kroki usage

_posts/2021/05/2021-05-21-diagrams-from-textual-descriptions.md

@@ -459,7 +459,7 @@ Taken from <https://graphviz.org/Gallery/directed/neural-network.html>.
 Taken from <http://blockdiag.com/en/blockdiag/examples.html>.
 
 ## Deployment
-The service is provided by HIFIS Software and hosted entirely on HZDR
+The service is provided by HIFIS Software and is hosted entirely on HZDR
 servers.
 It does not share any data with external providers.
 As usual, the deployment can be reproduced via the corresponding