feat: implement 4 future backlog tasks (side margins, max-width, 1240px header breakpoint, remove intl-conf category)

refer_landing_page/tests/e2e_test_suite.py

@@ -62,7 +62,6 @@ class TestANLHomepageE2E(unittest.TestCase):
     def test_03_publications_category_routes(self):
         """TC-T1-F5: Verify Publications categories SSG static pages."""
         cats = [
-            ("intl-conf.html", "International Conference"),
             ("intl-journal-conf.html", "International Journal"),
             ("domestic-journal-conf.html", "Domestic Journal"),
             ("patent.html", "Patent"),