Add nav link to dev dashboard

Invisible on mobile portrait layout - visible if device is turned to
landscape. Reasoning is that the dev dashboard is pretty unusable in
portrait mode anyway.

lib/music_library_web/components/layouts/app.html.heex

@@ -21,6 +21,9 @@
         </div>
       </div>
       <div class="flex space-x-8">
+        <a class={["max-sm:hidden" | nav_link_classes()]} } href={~p"/dev/dashboard"}>
+          <%= gettext("Dev dashboard") %>
+        </a>
         <a class={nav_link_classes()} } href={~p"/login"}>
           <%= gettext("Logout") %>
         </a>

priv/gettext/default.pot

@@ -143,7 +143,7 @@ msgstr ""
 msgid "Login"
 msgstr ""
 
-#: lib/music_library_web/components/layouts/app.html.heex:25
+#: lib/music_library_web/components/layouts/app.html.heex:28
 #, elixir-autogen, elixir-format
 msgid "Logout"
 msgstr ""
@@ -468,3 +468,8 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Made by"
 msgstr ""
+
+#: lib/music_library_web/components/layouts/app.html.heex:25
+#, elixir-autogen, elixir-format
+msgid "Dev dashboard"
+msgstr ""