Afegir cartells a les jams (i esquelet per a slow jams i notes)

folkugat_web/assets/templates/fragments/sessio/cartell.html

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+<div id="cartell"
+     class="flex flex-col items-center">
+{% if session.cartell_url %}
+  <div class="max-w-[655px] w-full
+              flex flex-col items-center">
+    {% if logged_in %}
+    <div class="my-2 w-full text-beige text-right">
+        <button title="Modifica el cartell"
+                class="mx-1"
+                hx-get="/api/sessio/{{ session_id }}/cartell/editor"
+                hx-target="#cartell"
+                hx-swap="outerHTML">
+          <i class="fa fa-pencil" aria-hidden="true"></i>
+        </button>
+        <button title="Esborra el cartell"
+                class="mx-1"
+                hx-delete="/api/sessio/{{ session_id }}/cartell"
+                hx-target="#cartell"
+                hx-swap="outerHTML">
+          <i class="fa fa-times" aria-hidden="true"></i>
+        </button>
+    </div>
+    {% endif %}
+    <img class="w-full h-auto"
+         src="{{ session.cartell_url }}"/>
+  </div>
+{% elif logged_in %}
+  <button class="text-beige mt-2"
+          hx-get="/api/sessio/{{ session_id }}/cartell/editor"
+          hx-target="#cartell"
+          hx-swap="outerHTML">
+      <i class="fa fa-plus" aria-hidden="true"></i>
+      Afegeix cartell
+  </button>
+{% endif %}
+</div>