Fix long titles, multiple headings and redirect links

src/components/RoadmapHeader.astro

@@ -42,7 +42,7 @@ const isRoadmapReady = !isUpcoming;
         {
           !hasSearch && (
             <>
-            <a href='/roadmaps' class='bg-gray-500 py-1.5 px-3 rounded-md text-white text-xs sm:text-sm font-medium hover:bg-gray-600' aria-label="Back to All Roadmaps">
+            <a href='/roadmaps/' class='bg-gray-500 py-1.5 px-3 rounded-md text-white text-xs sm:text-sm font-medium hover:bg-gray-600' aria-label="Back to All Roadmaps">
               &larr;<span class='hidden sm:inline'>&nbsp;All Roadmaps</span>
             </a>