add lunr package for search

package-lock.json

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@@ -9152,7 +9174,8 @@
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package.json

@@ -222,6 +222,7 @@
     "electron-store": "1.3.0",
     "electron-updater": "2.20.1",
     "keytar": "4.1.0",
+    "lunr": "2.1.6",
     "node-forge": "0.7.1",
     "rxjs": "5.5.6",
     "zone.js": "0.8.19"