refactor: extract userbot to standalone repo, add as git submodule

userbot now lives at ssh://git@gitssh.forust.xyz:2221/forust/userbot.git
and is included in homelab as a submodule at userbot/

userbot/.env.example

@@ -1,14 +0,0 @@
-# apiflash api key only for webshot plugin
-APIFLASH_KEY=""
-# gemini api key only for gemini plugin
-GEMINI_KEY=""
-# VT api key only for VirusTotal plugin
-VT_KEY=""
-# rmbg api key only for removebg plugin
-RMBG_KEY=""
-# cohere api key only for cohere plugin
-COHERE_KEY=""
-# sqlite/sqlite3 or mongo/mongodb 
-DATABASE_TYPE=""
-# file name for sqlite3, database name for mongodb 
-DATABASE_NAME=""