Fix https://github.com/scylladb/scylladb/issues/11598 This PR adds the troubleshooting article submitted by @syuu1228 in the deprecated _scylla-docs_ repo, with https://github.com/scylladb/scylla-docs/pull/4152. I copied and reorganized the content and rewritten it a little according to the RST guidelines so that the page renders correctly. @syuu1228 Could you review this PR to make sure that my changes didn't distort the original meaning? Closes #11626 * github.com:scylladb/scylladb: doc: apply the feedback to improve clarity doc: add the link to the new Troubleshooting section and replace Scylla with ScyllaDB doc: add the new page to the toctree doc: add a troubleshooting article about the missing configuration files