plugins: remove deprecated route registrations

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/api-docs/src/plugin.ts

@@ -22,7 +22,6 @@ import {
   createRoutableExtension,
 } from '@backstage/core';
 import { defaultDefinitionWidgets } from './components/ApiDefinitionCard';
-import { ApiExplorerPage as Page } from './components/ApiExplorerPage/ApiExplorerPage';
 import { apiDocsConfigRef } from './config';
 import { createComponentRouteRef, rootRoute } from './routes';
 
@@ -48,9 +47,6 @@ export const apiDocsPlugin = createPlugin({
   externalRoutes: {
     createComponent: createComponentRouteRef,
   },
-  register({ router }) {
-    router.addRoute(rootRoute, Page);
-  },
 });
 
 export const ApiExplorerPage = apiDocsPlugin.provide(