Remove unneeded templates

lib/nulla_web/components/templates/note/show.html.heex

@@ -1,15 +0,0 @@
-<.header>
-  Note {@note.id}
-  <:subtitle>This is a note record from your database.</:subtitle>
-  <:actions>
-    <.link href={~p"/notes/#{@note}/edit"}>
-      <.button>Edit note</.button>
-    </.link>
-  </:actions>
-</.header>
-
-<.list>
-  <:item title="Content">{@note.content}</:item>
-</.list>
-
-<.back navigate={~p"/notes"}>Back to notes</.back>