Add news post type with list and detail routes

Elternbeirat.Web/wwwroot/app.css

@@ -22,6 +22,37 @@ h1:focus {
     outline: none;
 }
 
+/* News list on /beitraege */
+.post-list {
+    list-style: none;
+    padding: 0;
+}
+
+.post-list li {
+    padding: 0.75rem 0;
+    border-bottom: 1px solid #eee;
+}
+
+.post-list a {
+    font-size: 1.1rem;
+    text-decoration: none;
+}
+
+.post-list time,
+.post-meta time {
+    display: block;
+    color: #777;
+    font-size: 0.85rem;
+}
+
+.post-meta {
+    display: flex;
+    justify-content: space-between;
+    align-items: baseline;
+    gap: 1rem;
+    margin-bottom: 1rem;
+}
+
 .valid.modified:not([type=checkbox]) {
     outline: 1px solid #26b050;
 }