Remove `sources/` under `docs` directory
Remove `sources/` under `docs` directory

See #13936.

Signed-off-by: ChaYoung You <e81a3f44f53ea94642bc84ba592fbe580ab2b0d7@gmail.com>

cpuguy83/cli,e11137/cli,redpanda/cli,riyazdf/cli,allencloud/cli,thaJeztah/cli,redpanda/cli,allencloud/cli,ashfall/cli,ashfall/cli,dnephin/cli,dnephin/cli,thaJeztah/cli,docker/cli,Zebrilee/cli,docker/cli,cpuguy83/cli,riyazdf/cli,e11137/cli,Zebrilee/cli