feat: add UMass Amherst theme support, implement HTML snippet management system, and update page rendering logic

sisvietnamvn_main/extract_content_top.py

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+import os
+from bs4 import BeautifulSoup
+
+file_path = "/home/x79/sisvietnamvn_01/sisvietnamvn_Trang chính thức hiện tại/UMass Amherst _ UMass Amherst.html"
+
+with open(file_path, "r", encoding="utf-8") as f:
+    soup = BeautifulSoup(f, "html.parser")
+
+content_top = soup.find(class_="content-top")
+
+if content_top:
+    # Let's save it to an artifact directly via python, or just print it and I will grab it.
+    output_path = "/home/x79/sisvietnamvn_01/sisvietnamvn_main/content_top_snippet.html"
+    with open(output_path, "w", encoding="utf-8") as f:
+        f.write(content_top.prettify())
+    print(f"Extracted content-top to {output_path}")
+else:
+    print("Could not find class='content-top'")