Sort imports from all files

Add "prettier" script in `package.json` to check if all files are
compliant.

Sort all imports and format all files by running `npm run lint -- --fix`
followed by `npm run prettier -- --write`.

Gitlab #29

Change-Id: Id80402d1344c3bc611f66a46cffeee5f2c375bd8
diff --git a/client/src/components/ListItemLink.js b/client/src/components/ListItemLink.js
index 8080de2..d020503 100644
--- a/client/src/components/ListItemLink.js
+++ b/client/src/components/ListItemLink.js
@@ -1,8 +1,8 @@
-import { useMemo, forwardRef } from 'react';
-import PropTypes from 'prop-types';
 import ListItem from '@mui/material/ListItem';
 import ListItemIcon from '@mui/material/ListItemIcon';
 import ListItemText from '@mui/material/ListItemText';
+import PropTypes from 'prop-types';
+import { forwardRef, useMemo } from 'react';
 import { Link as RouterLink } from 'react-router-dom';
 
 function ListItemLink(props) {