* Add link to flink-clickhouse-sink + fixes nearby
* Add link to dbal-doctrine
* cleanup ru toc root
* Sort out russian docs ToC a little bit
* Add link collection of commercial support services
* Create SECURITY.md
* [experimental] auto-mark documentation PRs with labels
* revert #6544
* Sync RPM packages instructions to other docs languages
* Move tutorial to documentation with old content (for now)
* refactor installation guide a bit
* add ../en/getting_started/index.md
* Rename ya_metrica_task.md
* Rename ya_metrica_task.md
* Refactor Yandex.Metrica dataset description
* WIP on rewriting tutorial
* tmp commit
* lots of docs fixes
* partially revert c136bee4ce
* try to fix docs build in CI
* try to fix docs build in CI
* few minor improvements
* Quick refactoring of last portion of tutorial (not thoroughly tested though)
* fix link