TLDR-451 tutorial new doc type (#331)

* docs added

* add code testing

* some fixes

* some fixes

* add tabula and some fixes

* add python-djvulibre

* delete python-djvulibre and add djvulibre-bin

* add poppler-utils

* add tesseract

* some fixes

* flake8 stylefix

* fix docs after flake8

* update last part of adding_new_doc_type_tutorial

* rewrite dedoc_add_new_doc_type_tutorial

* minor fixes

* minor fixes

* minor fixes

* some fixes

* add more code examples

* some fixes

---------

Co-authored-by: Nikita Shevtsov <[email protected]>
Co-authored-by: Nasty <[email protected]>