* 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* YT paragraph was badly outdated and there is no real reason to write a new one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
* Clean up docs folder by moving all build-related tools to subdirectory
* Remove unused script
* Remove unused script #2
* Some refactoring in concatenate.py
* Rewrite build.sh in Python
- Get rid of half of copypaste in yml files
- Draft of redirects support
* Actually include redirects.conf
* copy conf too
* Keep H1 the same in single page docs
* fix some paths
* Keep only pages index in yaml
* Workaround for missing jQuery
* Delay docs init
