Remove API key dependency from image fetching in generate_post_html function

post_blog.py

@@ -11,13 +11,12 @@ client_id = os.getenv('CLIENT_ID')
 client_secret = os.getenv('CLIENT_SECRET')
 refresh_token = os.getenv('REFRESH_TOKEN')
 blog_id = os.getenv('BLOG_ID')
-imgbb_api_key = os.getenv('IMGBB_API_KEY')
 
 def generate_post_html(doi, title, category, summary, mindmap, citation):
     doi = doi.split("https://")[-1]
     mindmap = mindmap.replace("{", r'{').replace("}", r'}')
     citation = mistune.html(repr(citation.replace("&", "&").replace("```plaintext\n", "").replace("\n```", "").strip())[1:-1])
-    image = fetch_image(title, category, summary, imgbb_api_key)
+    image = fetch_image(title, category, summary)
     html_summary = mistune.html(summary)
     post = f"""
     <div id="paper_post">