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/inputs.js b/client/src/components/inputs.js
index 42ca4be..a607a31 100644
--- a/client/src/components/inputs.js
+++ b/client/src/components/inputs.js
@@ -1,8 +1,9 @@
 import { Stack, TextField } from '@mui/material';
 import { styled } from '@mui/material/styles';
-import { useState, useCallback, useEffect } from 'react';
+import { useCallback, useEffect, useState } from 'react';
+
 import { InfoButton, ToggleVisibilityButton } from './buttons';
-import { CheckedIcon, RoundSaltireIcon, LockIcon, PenIcon, PersonIcon } from './svgIcons';
+import { CheckedIcon, LockIcon, PenIcon, PersonIcon, RoundSaltireIcon } from './svgIcons';
 
 const iconsHeight = '16px';
 const StyledCheckedIconSuccess = styled(CheckedIcon)(({ theme }) => ({