Remove Documentation

[asztalosors]

The documentation folder is not justified in the source code.

1. The CPO-IDS structures should be stored elsewhere, especially since they are obsolete.
2. Papers should be added to the readme.md

[gergopokol]

Wiki documentation to be updated, as calls have changed.
write_beamlet_profiles call updated in https://github.com/plasma-sds/renate/wiki/User's-Guide