Add "Media" tab for rooms (#196)

* WIP on Media tab to rooms

* handle error for downloadFile if it's missing

* Add warning message for rooms Media tab

* Fix error message for download media of rooms

* update readme

src/components/etke.cc/ServerStatusBadge.tsx

@@ -1,6 +1,6 @@
 import { Avatar, Badge, Theme, Tooltip } from "@mui/material";
 import { useEffect } from "react";
-import { useAppContext } from "../../App";
+import { useAppContext } from "../../Context";
 import { Button, useDataProvider, useStore } from "react-admin";
 import { styled } from '@mui/material/styles';
 import MonitorHeartIcon from '@mui/icons-material/MonitorHeart';