Fix MD004 warning about inconsistent list styles

Author: lfrancke

.readme/partials/main.md.j2

@@ -26,7 +26,7 @@ You can follow this [tutorial](https://docs.stackable.tech/home/stable/{{operato
 
 The Secret Operator provisions and mounts secrets, but unlike the default Kubernetes Secret mechanism, Secrets can be created and mounted dynamically based on Pod properties. The Operator supports:
 
-- Generating TLS certificates on demand and mounting them
+* Generating TLS certificates on demand and mounting them
 
 ## How it works
 

README.md

@@ -45,7 +45,7 @@ If you have a question about the Stackable Data Platform, contact us via our [ho
 
 The Secret Operator provisions and mounts secrets, but unlike the default Kubernetes Secret mechanism, Secrets can be created and mounted dynamically based on Pod properties. The Operator supports:
 
-- Generating TLS certificates on demand and mounting them
+* Generating TLS certificates on demand and mounting them
 
 ## How it works