chore(deps): update postgres docker tag to v18

docker/docker-compose.yml

@@ -37,7 +37,7 @@ services:
       retries: 3
 
   db:
-    image: postgres:17
+    image: postgres:18
     restart: unless-stopped
     environment:
       - POSTGRES_USER=gitea

src/_theme.scss

@@ -325,6 +325,11 @@ $lvl3: if($isDark, $base, $crust);
   color: var(--color-label-text) !important;
 }
 
+// repository topics edit button
+#manage_topic {
+  color: var(--color-text-light-2) !important;
+}
+
 // admonitions are using *-text variables for border/text colour
 // can't change values of the *-text variables without breaking readability on accented backgrounds
 blockquote {