List all sources and sinks in articles overview for lib-processing

[cthtrifork]

https://docs.cheetah.trifork.dev/libraries/cheetah-lib-processing/articles/sinks.html

Only a single sink is mentioned.

Link to stuff like: https://docs.cheetah.trifork.dev/libraries/cheetah-lib-processing/api/com.trifork.cheetah.processing.connector.kafka.html

for all connectors.

Should be easier to find

Especially because Trifork connectors are custom and wraps existing builders instead of extending standard kafka and os sources/sinks

[KristianTrifork]

Added sinks and sources to the list. Has been deployed.