fix(striker-ui-api): clear cookies on logout

striker-ui-api/src/lib/request_handlers/auth/logout.ts

@@ -1,17 +1,19 @@
 import { RequestHandler } from 'express';
 
+import { cname } from '../../cname';
 import { stdout } from '../../shell';
 
 export const logout: RequestHandler = (request, response) => {
   request.session.destroy((error) => {
-    let scode = 204;
-
     if (error) {
-      scode = 500;
-
       stdout(`Failed to destroy session upon logout; CAUSE: ${error}`);
+
+      return response.status(500).send();
     }
 
-    response.status(scode).send();
+    response.clearCookie(cname('user'));
+    response.clearCookie(cname('sid'));
+
+    return response.status(204).send();
   });
 };