Revert "ntrboot: add USPS warning"

USPS reversed course.

This reverts commit ff0cd28.

docs/ntrboot.md

@@ -1,11 +1,5 @@
 # ntrboot
 
-::: danger
-
-The United States Postal Service (USPS) has [suspended incoming packages from China and Hong Kong](https://about.usps.com/newsroom/service-alerts/international/suspension-of-inbound-parcels-from-china-and-hong-kong.htm). All product links listed below may not ship to the United States. For further support (in English), join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp).
-
-:::
-
 ::: tip
 
 If your flashcart comes pre-flashed with ntrboot (or you have already flashed ntrboot to your flashcart), you can skip to [Installing boot9strap (ntrboot)](installing-boot9strap-(ntrboot)) for instructions on how to use it.