chore: remove deprecated nginx commands

plugins/nginx-vhosts/subcommands/build-config

@@ -1,24 +0,0 @@
-#!/usr/bin/env bash
-set -eo pipefail
-[[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
-
-cmd-nginx-build-config() {
-  declare desc="build nginx config to proxy app containers from command line"
-  declare cmd="nginx:build-config"
-  [[ "$1" == "$cmd" ]] && shift 1
-  declare APP="$1"
-  verify_app_name "$APP"
-  dokku_log_warn "Deprecated: Please use proxy:build-config"
-
-  local PROXY_APP_TYPE
-  PROXY_APP_TYPE="$(plugn trigger proxy-type "$APP")"
-
-  if [[ "$PROXY_APP_TYPE" == "nginx" ]]; then
-    plugn trigger proxy-build-config "$APP"
-  else
-    dokku_log_fail "Configured proxy for ${APP} is ${PROXY_APP_TYPE}"
-  fi
-}
-
-cmd-nginx-build-config "$@"