fix jinja template value in run-container.md (#95)

Author: coretl

template/{% if sphinx %}docs{% endif %}/how-to/run-container.md.jinja

@@ -1,6 +1,6 @@
 # Run in a container
 
-Pre-built containers with {\{repo_name}} and its dependencies already
+Pre-built containers with {{repo_name}} and its dependencies already
 installed are available on [Github Container Registry](https://ghcr.io/{{github_org}}/{{repo_name}}).
 
 ## Starting the container