Remove instantsearch.js

Author: stevenjoezhang

package.json

@@ -26,7 +26,6 @@
     "firebase": "10.11.1",
     "gitalk": "1.8.0",
     "hexo-generator-searchdb": "1.4.1",
-    "instantsearch.js": "4.67.0",
     "katex": "0.16.9",
     "lozad": "1.16.0",
     "mathjax": "3.2.2",