Removes requirements.txt from docs folder (#177)

* Adds `pygments` as a project dependency

* Adjusts dependencies version

* Removes `requirements.txt` from docs folder

* Adds `docs` group and make it optional

.readthedocs.yml

@@ -1,12 +1,23 @@
 version: 2
 
-python:
-  version: 3.7
-  install:
-    - requirements: docs/requirements.txt
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.10"
+  jobs:
+    pre_create_environment:
+      - asdf plugin add poetry
+      - asdf install poetry latest
+      - asdf global poetry latest
+      - poetry config virtualenvs.create false
+      - poetry export --with docs --format=requirements.txt --output=requirements.txt
 
 sphinx:
   configuration: docs/conf.py
   fail_on_warning: true
 
+python:
+  install:
+    - requirements: requirements.txt
+
 formats: all

pyproject.toml

@@ -42,24 +42,30 @@ mypy = "^1.5.1"
 
 wemake-python-styleguide = "^0.18"
 flake8-pytest = "^1.4"
-flake8-pytest-style = "^1.7.2"
-flake8-pyi = "^23.6.0"
-nitpick = "^0.34.0"
+flake8-pytest-style = "^1.7"
+flake8-pyi = "^23.6"
+nitpick = "^0.34"
 
-safety = "^2.3.5"
+safety = "^2.3"
 
-pytest = "^7.4.2"
-pytest-cov = "^4.1.0"
-pytest-randomly = "^3.15.0"
-pytest-mypy-plugins = "^3.0.0"
+pytest = "^7.4"
+pytest-cov = "^4.1"
+pytest-randomly = "^3.15"
+pytest-mypy-plugins = "^3.0"
 
-sphinx = "^7.1"
-sphinx-autodoc-typehints = "^1.24.0"
-sphinxcontrib-mermaid = "^0.9.2"
-sphinx-typlog-theme = "^0.8.0"
-doc8 = "^1.1.1"
-m2r2 = "^0.3.3.post2"
-tomlkit = "^0.12.1"
+doc8 = "^1.1"
+
+[tool.poetry.group.docs]
+optional = true
+
+[tool.poetry.group.docs.dependencies]
+sphinx = "^6.2"
+sphinx-autodoc-typehints = "^1.23"
+sphinxcontrib-mermaid = "^0.9"
+sphinx-typlog-theme = "^0.8"
+m2r2 = "^0.3"
+tomlkit = "^0.12"
+pygments = "^2.16"
 
 [tool.nitpick]
 style = "https://raw.githubusercontent.com/wemake-services/wemake-python-styleguide/0.18.0/styles/nitpick-style-wemake.toml"