chore: remove deprecated proxy functions

plugins/proxy/functions

@@ -1,23 +0,0 @@
-#!/usr/bin/env bash
-set -eo pipefail
-[[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
-source "$PLUGIN_AVAILABLE_PATH/config/functions"
-
-is_app_proxy_enabled() {
-  declare desc="return true if proxy is enabled; otherwise return false"
-  declare APP="$1"
-  declare deprecated=true
-  dokku_log_warn "Deprecated: Use plugn#proxy-is-enabled"
-
-  plugn trigger proxy-is-enabled "$APP"
-}
-
-get_app_proxy_type() {
-  declare desc="return app proxy type"
-  declare APP="$1"
-  declare deprecated=true
-  dokku_log_warn "Deprecated: Use plugn#proxy-type"
-
-  plugn trigger proxy-type "$APP"
-}