Add package-data config to include HTML templates in build

Without this, pip-installed codedocent crashes on first use because
the Jinja2 templates are excluded from the wheel.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: clanker-lover

pyproject.toml

@@ -20,5 +20,8 @@ dependencies = [
 [project.optional-dependencies]
 dev = ["pytest>=7.0"]
 
+[tool.setuptools.package-data]
+codedocent = ["templates/*.html"]
+
 [project.scripts]
 codedocent = "codedocent.cli:main"