wiki: "Unteathered usage" missing official firmware

[bettse]

Looking at the unteathered usage (https://github.com/justcallmekoko/ESP32Marauder/wiki/flipper-zero#untethered-usage) on the wiki it doesn't include the official firmware (you can install the app from the app catalog: https://lab.flipper.net/apps/esp32_wifi_marauder).

Sorry to make this an issue, but I don't think it's possible to propose changes to the wiki with a PR. If it is, just point me to the way and I'll open a PR.