chore: remove deprecated proxy functions

docs/appendices/0.30.0-migration-guide.md

@@ -25,3 +25,6 @@
 - The following deprecated nginx commands have been removed:
     - `nginx:show-conf` (deprecated since since 0.20.0) has been removed in favor of `nginx:show-config`
     - `nginx:validate` (deprecated since since 0.20.0) has been removed in favor of `nginx:validate-config`
+- The following proxy functions - deprecated since 0.20.0 - have been removed in favor of their plugin trigger equivalents. Sourcing the `proxy/functions` file will fail going forward.
+    - `proxy#is_app_proxy_enabled()` is removed in favor of `plugn trigger proxy-is-enabled`.
+    - `proxy#get_app_proxy_type()` is removed in favor of `plugn trigger proxy-type`.

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"
-}