feat: 增加简易通知机器人和github插件的头像

server/plugins/com.msgbyte.github/web/plugins/com.msgbyte.github/manifest.json

@@ -2,6 +2,7 @@
   "label": "Github 订阅",
   "name": "com.msgbyte.github",
   "url": "{BACKEND}/plugins/com.msgbyte.github/index.js",
+  "icon": "https://api.iconify.design/entypo-social/github.svg",
   "version": "0.0.0",
   "author": "msgbyte",
   "description": "订阅Github项目动态到群组",

server/plugins/com.msgbyte.simplenotify/web/plugins/com.msgbyte.simplenotify/manifest.json

@@ -2,6 +2,7 @@
   "label": "简易机器人",
   "name": "com.msgbyte.simplenotify",
   "url": "{BACKEND}/plugins/com.msgbyte.simplenotify/index.js",
+  "icon": "/images/avatar/robot.webp",
   "version": "0.0.0",
   "author": "moonrailgun",
   "description": "一个简单的通用通知机器人, 用于直接向群组发送消息",