fix: remove unused shikiji (#7324)

Author: sreeisalso

packages/docs/package.json

@@ -45,7 +45,6 @@
     "react-dom": "18.3.1",
     "rehype-pretty-code": "0.11.0",
     "shiki": "0.14.7",
-    "shikiji": "0.9.19",
     "snarkdown": "2.0.0",
     "tailwindcss": "3.4.6",
     "terser": "5.31.3",