Remove async from generate_post_html and adjust image generation call

post_blog.py

@@ -40,12 +40,12 @@ def generate_image(title, summary, category):
         return f"data:image/png;base64,{image}"
     return image_url
 
-async def generate_post_html(title, summary, mindmap, category, citation):
+def generate_post_html(title, summary, mindmap, category, citation):
     title = title.replace("{", r"{{").replace("}", r"}}")
     summary = summary.replace("{", r"{{").replace("}", r"}}")
     mindmap = mindmap.replace("{", r"{{").replace("}", r"}}")
     citation = citation.replace("{", r"{{").replace("}", r"}}")
-    image = await generate_image(title, summary, category)
+    image = generate_image(title, summary, category)
     html_summary = mistune.html(summary)
     post = f"""
 <div>