Housekeeping of example config and readme

Update readme to current state and rename the example config to
prevent confusion.

README.md

@@ -81,14 +81,13 @@ Whereas `<config_dir>` depends on the platform:
 - Windows: `{FOLDERID_RoamingAppData}`
 
 # TODOs
-
-## Systemd service file
 ## Use `lazy_static` or `once_cell` for compiled regexes
 ## Use `clap` to parse command line arguments
 ## Implement the functionality to reply to certain webhooks
+## Configure rocket via config.yml
 ## Security
 ### https support
+    basically supported, but related to "Configure rocket via config.yml".
 ### Authentication features
 ### Secure cookies?
-## Parameterize fields
 ## Use proptest or quickcheck for tests of parsers