Podcast: add Threads and add auto publish

[MatitoDev]

Is your feature request related to a problem? Please describe.

• the podcast chat is rarely used and is a redundant channel
• the messages are not published

Describe the solution you'd like

• Add a Thread to every announce
• bot publish the message if the channel ist a News Channel

ToDos

• [ ] add Threads to every message
• [ ] publish message if news Channel