perf: do not publish demo.png

Author: kermanx

README.md

@@ -2,7 +2,7 @@
 
 Python runner for the [Monaco Runner feature](https://sli.dev/features/monaco-run) in [Slidev](https://sli.dev/). Code executed in browser using [Pyodide](https://pyodide.org/).
 
-![Demo](assets/demo.png)
+![Demo](https://cdn.jsdelivr.net/gh/KermanX/slidev-addon-python-runner/assets/demo.png)
 
 ## Usage
 

package.json

@@ -24,7 +24,6 @@
     "url": "https://github.com/KermanX"
   },
   "files": [
-    "assets",
     "setup",
     "README.md",
     "LICENSE",