Convert GenericErrorPage to TS

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

src/components/structures/GenericErrorPage.js

@@ -1,36 +0,0 @@
-/*
-Copyright 2019 New Vector Ltd
-
-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.
-*/
-
-import React from 'react';
-import PropTypes from 'prop-types';
-import { replaceableComponent } from "../../utils/replaceableComponent";
-
-@replaceableComponent("structures.GenericErrorPage")
-export default class GenericErrorPage extends React.PureComponent {
-    static propTypes = {
-        title: PropTypes.object.isRequired, // jsx for title
-        message: PropTypes.object.isRequired, // jsx to display
-    };
-
-    render() {
-        return <div className='mx_GenericErrorPage'>
-            <div className='mx_GenericErrorPage_box'>
-                <h1>{ this.props.title }</h1>
-                <p>{ this.props.message }</p>
-            </div>
-        </div>;
-    }
-}