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* [R-package] [docs] remove devtools dependency for docs builds

* linting

* updating docs conda env

* empty roxygenize()

* env for R libraries

* get logs

* remove comment

* added pkgdown URLs

* more paths

* fix incorrect YAML keys

* update DESCRIPTION URL link

* more URL changes

* revert DESCRIPTION changes

* remove ca-certificates

* empty commit

* Update docs/conf.py
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* empty commit

* remove outdated line in build_r.R
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* added R-package docs generation routines

* change theme to be more consistent with sphinx_rtd_theme on main site in terms of color scheme

* placed man folder with old Rd files back

* specify full path to conda and make script more readable by one line - one pkg

* removed commented lines from build_r_site script

* made one line - one argument in build_reference() call

* pin R package versions

* fixed conflict