Fixup documentation

- better gomarkdown generation that now fixed the escaped strings, no
  need to use pandoc anymore
- added workflow image
- upgraded versions of mkdocs requirements

doc/docs/packages/cmd/katenary.md

@@ -2,7 +2,11 @@
 
 # katenary
 
-``` go
+```go
 import "katenary/cmd/katenary"
 ```
 
+Katenary CLI, main package.
+
+This package is not intended to be imported. It contains the main function that build the command line with \`cobra\` package.
+