Make sidebar search field work (#3362)

* Make sidebar search field work

Extend the search page to have the ability to react to query parameters. The search in the sidebar now navigates to the search page and passes the query parameter. The search box on the search page is now debounced.

Closes #3341

* Fix sidebar search while the search page is already open

plugins/search/package.json

@@ -21,14 +21,15 @@
   },
   "dependencies": {
     "@backstage/core": "^0.3.1",
+    "@backstage/plugin-catalog": "^0.2.2",
     "@backstage/theme": "^0.2.1",
     "@material-ui/core": "^4.11.0",
     "@material-ui/icons": "^4.9.1",
     "@material-ui/lab": "4.0.0-alpha.45",
-    "@backstage/plugin-catalog": "^0.2.2",
-    "react-router-dom": "6.0.0-beta.0",
+    "qs": "^6.9.4",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
+    "react-router-dom": "6.0.0-beta.0",
     "react-use": "^15.3.3"
   },
   "devDependencies": {
@@ -40,8 +41,8 @@
     "@testing-library/user-event": "^12.0.7",
     "@types/jest": "^26.0.7",
     "@types/node": "^12.0.0",
-    "msw": "^0.21.2",
-    "cross-fetch": "^3.0.6"
+    "cross-fetch": "^3.0.6",
+    "msw": "^0.21.2"
   },
   "files": [
     "dist"