Update app.py

Forgot import statement and updated render_page function

app.py

@@ -1,6 +1,7 @@
 import streamlit as st
 import re
 from pathlib import Path
+import importlib
 
 import yaml
 
@@ -21,10 +22,8 @@ def render_preview(image, title, description):
 
 
 def render_page(post_path: Path):
-    text = post_path.read_text()
-    match = REGEX_YAML_BLOCK.search(text)
-    page_content = match.group(2) if match else text
-    st.markdown(page_content, unsafe_allow_html=True)
+    mod = importlib.import_module(str(post_path))
+    mod.run_article()
 
 
 def get_page_data(post_path: Path):