Enable new search experience by default on Develop & Nightly (element-hq#314)

Author: t3chguy

element.io/nightly/config.json

@@ -49,6 +49,8 @@
         "projectApiKey": "phc_Jzsm6DTm6V2705zeU5dcNvQDlonOR68XvX2sh1sEOHO",
         "apiHost": "https://posthog.hss.element.io"
     },
-    "features": {},
+    "features": {
+        "feature_spotlight": true
+    },
     "map_style_url": "https://api.maptiler.com/maps/basic/style.json?key=JCdnMQY3oGklTYYLIvtI"
 }