remove ping command, add backshot command, add nice font to chatwidget, add first time chatting warning

src/lib/invuln.ts

@@ -14,3 +14,7 @@ export async function addInvuln(userid: string) {
 export async function removeInvuln(userid: string) {
   return await redis.del(`user:${userid}:invulnerable`);
 };
+export async function setTemporaryInvuln(userid: string) {
+  await redis.set(`user:${userid}:invulnerable`, '1');
+  await redis.expire(`user:${userid}:invulnerable`, 600);
+};