Add server status page and a badge in AppBar (#182)

* WIP: Add server status and running process indicators

* Finish ServerStatusPage and ServerRunningProcess

* fix typos, add running process info to the server status page

* Remove ServerRunningProcess and integrate it into ServerStatusBadge

* remove divider in menu

* display time as started X minutes ago

* add documentation; clearly state what new components are; update readme

* change wording a bit, cross-link with docs/README.md

* use returned HTML

* Finish ServerStatus page and badges

* Fix types

* cleanup

* remove some code

* adjust config load

src/App.tsx

@@ -22,9 +22,10 @@ import rooms from "./resources/rooms";
 import userMediaStats from "./resources/user_media_statistics";
 import users from "./resources/users";
 import authProvider from "./synapse/authProvider";
-import dataProvider from "./synapse/dataProvider";
+import dataProvider, { ServerStatusResponse } from "./synapse/dataProvider";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { Config } from "./utils/config";
+import ServerStatusPage from "./components/etke.cc/ServerStatusPage";
 
 // TODO: Can we use lazy loading together with browser locale?
 const messages = {
@@ -64,6 +65,7 @@ export const App = () => (
     >
       <CustomRoutes>
         <Route path="/import_users" element={<UserImport />} />
+        <Route path="/server_status" element={<ServerStatusPage />} />
       </CustomRoutes>
       <Resource {...users} />
       <Resource {...rooms} />