implement search service

package.json

@@ -26,7 +26,7 @@
     "@angular/compiler-cli": "5.2.0",
     "@ngtools/webpack": "1.10.2",
     "@types/jquery": "^3.3.2",
-    "@types/lunr": "2.1.5",
+    "@types/lunr": "^2.1.6",
     "@types/node": "8.0.19",
     "@types/node-forge": "0.6.10",
     "@types/papaparse": "4.1.33",
@@ -73,7 +73,7 @@
     "duo_web_sdk": "git+https://github.com/duosecurity/duo_web_sdk.git",
     "font-awesome": "4.7.0",
     "jquery": "3.3.1",
-    "lunr": "2.1.6",
+    "lunr": "2.3.1",
     "mousetrap": "1.6.1",
     "ngx-infinite-scroll": "0.8.4",
     "node-forge": "0.7.1",