feat: update MetaMask logo and assets (#235)

Author: tannn-younet

public/fox.ico

@@ -3,7 +3,7 @@
     height: 170px;
     display: flex;
     flex: 1;
-    background: #E9F2FF;
+    background: #190066;
     margin-bottom: 55px;
     position: relative;
     align-items: center;

public/logo-192.png

@@ -1,13 +1,11 @@
 import React, { Component } from 'react'
 import BgImage from '../../images/bg-img.svg';
-import LogoWordmark from '../../images/logo-wordmark.svg';
 import './index.css';
 
 export default class Header extends Component {
     render(){
         return (
             <div className={'header'}>
-                <img src={LogoWordmark}  className={'header logo-img'} alt={'background'} />
                 <img src={BgImage}  className={'header bg-img'} alt={'background'} />
             </div>
         );