Configure Ruff to replace Black and isort

- Remove [tool.black] and [tool.isort] configuration sections
- Add ruff>=0.8.0 as development dependency
- Configure [tool.ruff] with line-length=79, target-version=py311
- Set up [tool.ruff.format] with Black-compatible settings
- Configure [tool.ruff.isort] with Django-aware import sorting
- Add [tool.ruff.lint] with basic linting rules (E, F, W, I)
- Exclude migrations directory from formatting and linting

This maintains existing code style while consolidating formatting,
import sorting, and linting into a single faster tool.

Author: karbassi

.kiro/specs/black-to-ruff-migration/tasks.md

@@ -1,6 +1,6 @@
 # Implementation Plan
 
-- [ ] 1. Configure Ruff in pyproject.toml
+- [x] 1. Configure Ruff in pyproject.toml
 
   - Remove existing [tool.black] and [tool.isort] configuration sections
   - Add comprehensive [tool.ruff] configuration with general settings (line-length = 79, target-version = "py311", exclude migrations)

pyproject.toml

@@ -54,6 +54,7 @@ dependencies = [
 
     # Development & Debugging
     "django-debug-toolbar>=5.2.0,<6.0.0",
+    "ruff>=0.8.0,<1.0.0",
 
     # Testing
     "django-nose>=1.4.7,<2.0.0",
@@ -75,37 +76,36 @@ dependencies = [
 Repository = "https://github.com/weallcode/website"
 Homepage = "https://github.com/weallcode/website"
 
-[tool.black]
+[tool.ruff]
 line-length = 79
-target-version = ["py311"]
-include = '\.pyi?$'
-exclude = '''
-/(
-    \.eggs
-  | \.git
-  | \.hg
-  | \.mypy_cache
-  | \.tox
-  | \.venv
-  | _build
-  | buck-out
-  | build
-  | dist
-  | migrations
-)/
-'''
-
-[tool.isort]
-profile = "black"
-line_length = 79
-multi_line_output = 3
-include_trailing_comma = true
-combine_as_imports = true
-force_grid_wrap = 2
-use_parentheses = true
-remove_redundant_aliases = true
-known_django = "django"
-sections = "FUTURE,STDLIB,DJANGO,THIRDPARTY,FIRSTPARTY,LOCALFOLDER"
-skip_gitignore = true
-skip = [".gitignore", ".dockerignore", ".venv"]
-skip_glob = ["**/migrations/*.py"]
+target-version = "py311"
+exclude = [
+    ".eggs",
+    ".git",
+    ".hg",
+    ".mypy_cache",
+    ".tox",
+    ".venv",
+    "_build",
+    "buck-out",
+    "build",
+    "dist",
+    "migrations",
+]
+
+[tool.ruff.format]
+quote-style = "double"
+indent-style = "space"
+skip-source-first-line = false
+line-ending = "auto"
+
+[tool.ruff.isort]
+known-django = ["django"]
+section-order = ["future", "standard-library", "django", "third-party", "first-party", "local-folder"]
+combine-as-imports = true
+force-wrap-aliases = true
+split-on-trailing-comma = true
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I"]
+ignore = []