docs: remove prettier config

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

docs/prettier.config.js

@@ -1,21 +0,0 @@
-/*
- * Copyright 2020 The Backstage Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-// Use Object.assign since we haven't configured eslint for ... support in here
-module.exports = Object.assign({}, require('@spotify/prettier-config'), {
-  proseWrap: 'always',
-  printWidth: 80,
-});