* feat: update required packages versions

* feat: downgrade scikit-learn to not break tests

* chore: move updated kenlm dependency to a separate requirements file

* fix: add spelling requirements to the kbqa_rus config

* fix: remove empty line in kenlm.txt

* docs: update required python version in README.md

* feat: update tensorflow version

* feat: require newer lxml version==4.3.4

* feat: last sklearn version

* chore: config for sklearn classifier and new model

* fix: new model files

* fix: new model files

* fix: new model files

* fix: new model files

* tests: update jenkinsfile to run tests on cuda-10.0 in python3.7

* feat: update core dependencies

* tests: fix commands order in Jenkinsfile

* tests: cd back to tests after building docs

* chore: update version to 0.5.0

* docs: add breaking changes description for 0.5.0

* docs: add python3.7 support info

* docs: environment via venv module

* docs: shorten installation section

* docs: mv logo up and intro rewrite

* docs: logo resize

* docs: rm hello bot from readme

* feat: add python37 to docs

* feat: new structure of docs

* docs: simplify rest api doc

* docs: rewrite integration doc

* docs: minor fixes, component -> model

* docs: rename Component -> Model everywhere

* docs: mv data processors to dev guide

* docs: add contribution guide

* docs: restructure main doc tree

* docs: add quick links

* docs: make links italic font

* docs: refactor docker hub doc

* docs: add docker installation doc

* docs: models & skills to lower level of hyerarchy

* docs: add todos

* refactor: change dir hyerarchy

* docs: contributor guide minor fixes

* fix: unit tests are not really unit

* docs: show subsections of modesl in the main index

* docs: no features in readme

* docs: add table of contexts for features

* docs: refactor and fix BERT models descriptions

* docs: add custom BERT init usage guide

* Apply suggestions from code review

Co-Authored-By: Aleksei Lymar <lymar@ipavlov.ai>

* docs: resolve @yoptar's suggestions

* docs: @dilya's suggestions

* fix: custom bert tasks mentions

* docs: add link to config description

* docs: google style != pep8

* docs: minor additions and fixes to quick start

* docs: add BERT to the embeddings section

* docs: fix readme links

* docs: add quick start to readme

* docs: fix readme

* docs: installation before quickstart

* docs: apply suggestions from code review