GitLab

* Update code example

* Fix code quality

* Add comment

* Fix bad examples

* Add black formatting to style_doc

* Use first nonempty line

* Put it at the right place

* Don't add spaces to empty lines

* Better templates

* Deal with triple quotes in docstrings

* Result of style_doc

* Enable mdx treatment and fix code examples in MDXs

* Result of doc styler on doc source files

* Last fixes

* Break copy from

* PoC for conserving old links

* Do the same for other links

* remap the redirects section

* add instructions on how to move sections

* improve
Co-authored-by: Stas Bekman <stas@stason.org>

* Convert Trainer doc page to MarkDown

* Fix repo consistency

* Fix the doc build test job