Topic's readme/documentation disappear after promotion

# What happened?

I created topic with documentation (readme), and promoted on higher environment. The promoted topic has no documentation.

# What did you expect to happen?

Promoted topic should be base topic with changes set during promotion. Documentation isn't cloned/linked to new topic. It has to be copied manually. It requires additional work after approving request on every environment.

Suggestion:
Copy documentation and enable it for editing during topic promotion.

# What else do we need to know?

Klaw 2.9.0