moved html mocks to html sub folder and updated conftest.py to read from new location with better path and endpoint handling

tests/mocks/html/simple.json

@@ -0,0 +1,7 @@
+{
+  "title": "Test Page",
+  "description": "Simple test page",
+  "content": "Hello World",
+  "link_url": "https://example.com",
+  "link_text": "Link"
+}