use svg images

Author: ota-meshi

README.md

@@ -8,7 +8,7 @@
 [![npm](https://img.shields.io/npm/dt/cheetah-grid.svg)](http://www.npmtrends.com/cheetah-grid)
 [![Build Status](https://github.com/future-architect/cheetah-grid/workflows/CI/badge.svg?branch=master)](https://github.com/future-architect/cheetah-grid/actions?query=workflow%3ACI)
 
-[![Cheetah Grid](https://future-architect.github.io/cheetah-grid/logo.png)](https://future-architect.github.io/cheetah-grid/)
+[![Cheetah Grid](https://future-architect.github.io/cheetah-grid/logo.svg)](https://future-architect.github.io/cheetah-grid/)
 
 The fastest open-source data table for web.
 

docs/404.html

@@ -7,7 +7,7 @@
   <meta name="description" content="Cheetah Grid">
   <title>Cheetah Grid</title>
   <meta name="theme-color" content="#ff9933">
-  <link rel="shortcut icon" type="image/x-icon" href="./icon_512x512.ico">
+  <link rel="shortcut icon" type="image/svg+xml" href="./icon_512x512.svg">
   <link href='https://fonts.googleapis.com/css?family=Roboto' rel='stylesheet' type='text/css'>
   <link rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/icon?family=Material+Icons">
   <style type="text/css">