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Refs: https://github.com/scylladb/scylla-docs/issues/4091 Fixes https://github.com/scylladb/scylla-docs/issues/3419 This PR moves the installation instructions from the [website](https://www.scylladb.com/download/) to the documentation. Key changes: - The instructions are mostly identical, so they were squeezed into one page with different tabs. - I've merged the info for Ubuntu and Debian, as well as CentOS and RHEL. - The page uses variables that should be updated each release (at least for now). - The Java requirement was updated from Java 8 to Java 11 following [this issue](https://github.com/scylladb/scylla-docs/issues/3419). - In addition, the title of the Unified Installer page has been updated to communicate better about its contents. Closes #14504 * github.com:scylladb/scylladb: doc: update the prerequisites section doc: improve the tile of Unified Installer page doc: move package install instructions to the docs
