add pre-commit, update dev docs

Author: ThomasWaldmann

.pre-commit-config.yaml

@@ -0,0 +1,10 @@
+repos:
+ -   repo: https://github.com/psf/black
+     rev: 24.3.0
+     hooks:
+     -   id: black
+ -   repo: https://github.com/pycqa/flake8
+     rev: 6.1.0
+     hooks:
+     -   id: flake8
+         files: '(src|_ui_tests|contrib|scripts|quickinstall.py)'

docs/devel/development.rst

@@ -107,6 +107,9 @@ add more tools, exercise tools
 * create local docs::
 
     ./m docs  # Windows: m docs
+* install the pre-commit hook::
+
+    pre-commit install  # pre-commit is used for code linting / auto-format
 * set options on your favorite editor or IDE
 
   - convert tabs to 4 spaces

requirements.d/development.txt

@@ -5,3 +5,4 @@ pytest
 lxml
 # for sitetesting
 scrapy>=2.10.1
+pre-commit