* Some improvements for introduction/performance.md
* Minor improvements for example_datasets
* Add website/package-lock.json to .gitignore
* YT paragraph was badly outdated and there is no real reason to write a new one
* Use weird introduction article as a starting point for F.A.Q.
* Some refactoring of first half of ya_metrika_task.md
* minor
* Weird docs footer bugfix
* Forgotten redirect
* h/v scrollbars same size in docs
* CLICKHOUSE-3831: introduce security changelog
* A bit more narrow tables on docs front page
* fix flag in ru docs
* Save some space in top level of docs ToC
* Capitalize most words in titles of docs/en/
* more docs scrollbar fixes
* fix incorrect merge
* fix link
* fix switching languages in single page docs mode
* Update mkdocs & mkdocs-material + unminify javascript
* cherrypick 17e18d1ecc
* Additional .gitignore entries
* Merge a bunch of small articles about system tables into single one
* Merge a bunch of small articles about formats into single one
* Adapt table with formats to English docs too
* Add SPb meetup link to main page
* Move Utilities out of top level of docs (the location is probably not yet final) + translate couple articles
* Merge MacOS.md into build_osx.md
* Move Data types higher in ToC
* Publish changelog on website alongside documentation
* Few fixes for en/table_engines/file.md
* Use smaller header sizes in changelogs
* Group up table engines inside ToC
* Move table engines out of top level too
* Specificy in ToC that query language is SQL based. Thats a bit excessive, but catches eye.
* Move stuff that is part of query language into respective folder
* Move table functions lower in ToC
* Lost redirects.txt update
* Do not rely on comments in yaml + fix few ru titles
* Extract major parts of queries.md into separate articles
* queries.md has been supposed to be removed
* Fix weird translation
* Fix a bunch of links
* There is only table of contents left
* "Query language" is actually part of SQL abbreviation
* Change filename in README.md too
* fix mistype
