fix(callouts): reduce inner bottom spacing (#10944)

* fix(layout): remove unnecessary margin-bottom on last paragraph

We already add margins to all paragraphs, and this specific rule
caused trailing margin in callouts (previously also in noteblocks,
but this was overridden using !important).

* chore(notecard): remove unnecessary !important flag

This is no longer necessary, as the specific p:last-child rule is gone.

client/src/document/index.scss

@@ -213,10 +213,6 @@
   .section-content {
     p {
       font: var(--type-article-p);
-
-      &:last-child {
-        margin-bottom: 2rem;
-      }
     }
 
     figure {

client/src/ui/molecules/notecards/index.scss

@@ -17,7 +17,7 @@
 
   p {
     line-height: 2;
-    margin: 0 !important;
+    margin: 0;
   }
 
   &:before {