chore(styles): drop the dead manual-deploy CSS block

8fdb468 removed the only component matching app-manual-deploy and the
.clear-memory-button rule inside it, leaving the block in styles.scss with no
consumer anywhere in the tree.

client/src/styles.scss

@@ -2296,15 +2296,6 @@ app-alerts {
 }
 // ALERTS.COMPONENT END
 
-// MANUAL-DEPLOY.COMPONENT
-app-manual-deploy {
-  .clear-memory-button {
-    right: 10px;
-    top: 2px;
-  }
-}
-// MANUAL-DEPLOY.COMPONENT END
-
 // LINEAGE.COMPONENT
 app-lineage {
   .toggle-switch input[type='checkbox']:checked + label:before {