[Enhancement] Add "Copy JSON" action button to help when troubleshooting (#224)

* [WIP] [skip ci]

* Added 'copy JSON' button to all dropdowns; hopefully fixed some CSS silliness

lib/pinchflat_web/controllers/sources/source_html/show.html.heex

@@ -17,7 +17,7 @@
   </nav>
 </div>
 <div class="rounded-sm border border-stroke bg-white px-5 py-5 shadow-default dark:border-strokedark dark:bg-boxdark sm:px-7.5">
-  <div class="max-w-full overflow-x-auto">
+  <div class="max-w-full">
     <.tabbed_layout>
       <:tab_append>
         <.actions_dropdown source={@source} conn={@conn} />