Remove system.py

Updates to deployed API are to be handled manually.

routers/system.py

@@ -1,15 +0,0 @@
-import sys
-
-from fastapi import APIRouter, Depends
-from fastapi.security.api_key import APIKey
-
-import subprocess
-from .security import get_system_key
-
-router = APIRouter()
-
-
-@router.post("/system/update")
-def update(access_token: APIKey = Depends(get_system_key)):
-    output = subprocess.check_output(['git', 'pull'], encoding='utf-8')
-    sys.exit(4)