[Docs] Use uppercase SKILL.md for skills discovery

The npx skills tool fetches SKILL.md (uppercase) from the URL,
so we need to serve the file with that exact case.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: peterschmidt85

scripts/docs/hooks.py

@@ -184,14 +184,14 @@ def _write_well_known_skills(config, site_dir):
 
     out_dir = os.path.join(site_dir, WELL_KNOWN_SKILLS_DIR, name)
     os.makedirs(out_dir, exist_ok=True)
-    shutil.copy2(skill_src, os.path.join(out_dir, "skill.md"))
+    shutil.copy2(skill_src, os.path.join(out_dir, "SKILL.md"))
     # Serve skill at site root (e.g. https://dstack.ai/skill.md) from skills/dstack/SKILL.md
     shutil.copy2(skill_src, os.path.join(site_dir, "skill.md"))
 
     index_path = os.path.join(site_dir, WELL_KNOWN_SKILLS_DIR, "index.json")
     index = {
         "skills": [
-            {"name": name, "description": description.strip()[:1024], "files": ["skill.md"]}
+            {"name": name, "description": description.strip()[:1024], "files": ["SKILL.md"]}
         ]
     }
     with open(index_path, "w", encoding="utf-8") as f: