appview: add missing shadows to few components

appview/pages/templates/layouts/footer.html

···
 {{ define "layouts/footer" }}
-<div class="w-full p-4 bg-white dark:bg-gray-800 rounded-t">
+<div class="w-full p-4 bg-white dark:bg-gray-800 rounded-t drop-shadow-sm">
     <div class="container mx-auto text-center text-gray-600 dark:text-gray-400 text-sm">
         <span class="font-semibold italic">tangled</span> &mdash; made by <a href="/@oppi.li">@oppi.li</a> and <a href="/@icyphox.sh">@icyphox.sh</a>
     </div>

appview/pages/templates/repo/fragments/cloneInstructions.html

···
         {{ $knot = "tangled.sh" }}
     {{ end }}
     <section
-        class="mt-4 p-6 rounded bg-white dark:bg-gray-800 dark:text-white w-full mx-auto overflow-auto flex flex-col gap-4"
+        class="mt-4 p-6 rounded drop-shadow-sm bg-white dark:bg-gray-800 dark:text-white w-full mx-auto overflow-auto flex flex-col gap-4"
     >
         <div class="flex flex-col gap-2">
             <strong>push</strong>

appview/pages/templates/repo/index.html

···
 {{ define "repoAfter" }}
     {{- if .HTMLReadme }}
         <section
-            class="p-6 mt-4 rounded-br rounded-bl bg-white dark:bg-gray-800 dark:text-white w-full mx-auto overflow-auto {{ if not .Raw }}
+            class="p-6 mt-4 rounded-br rounded-bl bg-white dark:bg-gray-800 dark:text-white drop-shadow-sm w-full mx-auto overflow-auto {{ if not .Raw }}
                 prose dark:prose-invert dark:[&_pre]:bg-gray-900
                 dark:[&_code]:text-gray-300 dark:[&_pre_code]:bg-gray-900
                 dark:[&_pre]:border dark:[&_pre]:border-gray-700