respect Markdown line breaks

static_src/base.css

@@ -8,3 +8,7 @@
         font-family: "Roboto Condensed", system-ui, sans-serif;
     }
 }
+
+.prose :where(p):not(:where([class~="not-prose"] *)) {
+    @apply whitespace-pre-line
+}

ucebnice/templates/admin/base_site.html

@@ -77,6 +77,10 @@
     .module caption, .inline-group h2 {
         text-transform: none;
     }
+
+    .markdownx-preview p {
+        white-space: pre-line
+    }
 </style>
 {% endblock %}