chore: remove unused assets and sponsor page

scripts/plugin/template/README.md

@@ -8,4 +8,4 @@
 
 ## License
 
-MIT © Harvey Zack
+MIT © Harvey Zhao

scripts/plugin/template/package.json

@@ -2,7 +2,7 @@
   "name": "artplayer-plugin-{{name}}",
   "version": "1.0.0",
   "description": "{{name}} plugin for ArtPlayer",
-  "author": "Harvey Zack <laozhaochaguan@gmail.com>",
+  "author": "Harvey Zhao <laozhaochaguan@gmail.com>",
   "license": "MIT",
   "homepage": "https://artplayer.org",
   "repository": {