basic search implementation

package.json

@@ -32,6 +32,7 @@
     "cli-spinner": "^0.2.10",
     "d3": "^7.8.5",
     "esbuild-sass-plugin": "^2.9.0",
+    "flexsearch": "0.7.21",
     "github-slugger": "^2.0.0",
     "globby": "^13.1.4",
     "gray-matter": "^4.0.3",
@@ -69,6 +70,7 @@
   "devDependencies": {
     "@types/cli-spinner": "^0.2.1",
     "@types/d3": "^7.4.0",
+    "@types/flexsearch": "^0.7.3",
     "@types/hast": "^2.3.4",
     "@types/node": "^20.1.2",
     "@types/pretty-time": "^1.1.2",