Remove pixi.js dependency

Co-authored-by: Dhravya Shah <[email protected]>

Author: github-actions[bot]

package.json

@@ -87,7 +87,6 @@
     "next-themes": "^0.4.6",
     "orderedmap": "^2.1.1",
     "papaparse": "^5.5.2",
-    "pixi.js": "^8.14.0",
     "postgres": "^3.4.5",
     "prosemirror-example-setup": "^1.2.3",
     "prosemirror-inputrules": "^1.5.0",