Reorganize directories (#3462)

* 🚚 move files
* 🚚 rename doc folder to docs
* 🚚 rename test folder to tests

docs/mkdocs/requirements.txt

@@ -0,0 +1,48 @@
+Babel==2.10.1
+certifi==2021.10.8
+charset-normalizer==2.0.12
+click==8.1.2
+csscompressor==0.9.5
+future==0.18.2
+ghp-import==2.0.2
+gitdb==4.0.9
+GitPython==3.1.27
+htmlmin==0.1.12
+httplib2==0.20.4
+idna==3.3
+importlib-metadata==4.11.3
+Jinja2==3.1.1
+joblib==1.1.0
+jsmin==3.0.1
+livereload==2.6.3
+lunr==0.6.2
+Markdown==3.3.6
+markdown-include==0.6.0
+MarkupSafe==2.1.1
+mergedeep==1.3.4
+mkdocs==1.3.0
+mkdocs-git-revision-date-localized-plugin==1.0.1
+mkdocs-material==8.2.10
+mkdocs-material-extensions==1.0.3
+mkdocs-minify-plugin==0.5.0
+mkdocs-simple-hooks==0.1.5
+nltk==3.7
+packaging==21.3
+plantuml==0.3.0
+plantuml-markdown==3.5.2
+Pygments==2.11.0
+pymdown-extensions==9.3
+pyparsing==3.0.8
+python-dateutil==2.8.2
+pytz==2022.1
+PyYAML==6.0
+pyyaml_env_tag==0.1
+regex==2022.4.24
+requests==2.27.1
+six==1.16.0
+smmap==5.0.0
+tornado==6.1
+tqdm==4.64.0
+urllib3==1.26.9
+watchdog==2.1.7
+zipp==3.8.0