Rewrite README and docs in English for GitHub, add MIT license, remove internal files

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

setup.py

@@ -4,7 +4,8 @@ from setuptools import setup, find_packages
 setup(
     name='lidar_pipeline',
     version='2.0.0',
-    description='Pipeline LiDAR pour détection archéologique',
+    description='Archaeology-grade relief maps from IGN LiDAR HD point clouds',
+    license='MIT',
     packages=find_packages(),
     package_data={'lidar_pipeline': [
         'web/*',