Migrate to poetry, update nixpkgs

pyproject.toml

@@ -0,0 +1,46 @@
+[tool.poetry]
+name = "strojnadzor"
+version = "0.1.0"
+description = "Strojnadzor site"
+authors = ["Andrey Golovizin <ag@sologoc.com>"]
+license = "AGPLv3"
+
+[tool.poetry.dependencies]
+python = "^3.8"
+
+aldryn-forms = "~4.0.1"
+Django = "~2.1"
+django-classy-tags = "~=0.9"
+django-cms = "3.7.1"
+django-filer = "~1.7"
+django-mptt = "~0.11"
+django-sekizai = "~1.1"
+django-treebeard = "~4.3"
+djangocms-admin-style = "~1.4"
+djangocms-bootstrap4 = "~1.5"
+djangocms-file = "~2.4"
+djangocms-googlemap = "~1.3"
+djangocms-link = "~2.5"
+djangocms-picture = "~2.3"
+djangocms-snippet = "~2.2"
+djangocms-style = "~2.2"
+djangocms-text-ckeditor = "~3.8"
+djangocms-video = "~2.2"
+easy-thumbnails = "~2.7.1"
+gunicorn = "^20.1.0"
+python-dotenv = "^0.18.0"
+
+[tool.poetry.dev-dependencies]
+black = "^21.6b0"
+flake8 = "^3.9.2"
+isort = "^5.9.2"
+pyls-isort = "^0.2.2"
+python-lsp-black = "^1.0.0"
+python-lsp-server = "^1.1.0"
+
+[tool.poetry.scripts]
+strojnadzor = "strojnadzor.__main__:main"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"