Improve index tables and improved consistency (#97)

* Simplifies index pages

* Improved UX of more pages

lib/pinchflat_web/controllers/media_items/media_item_html/show.html.heex

@@ -30,7 +30,7 @@
             method="delete"
             data-confirm="Are you sure you want to delete this record and all associated files on disk? This cannot be undone."
           >
-            <.button color="bg-meta-1" rounding="rounded-full">
+            <.button color="bg-meta-1" rounding="rounded-lg">
               Delete Files
             </.button>
           </.link>