both bolt.observer and LN Node Insights has been down for awhile, so not relevant anymore

Author: drymi11

doc/node-operators-guide/analytics.md

@@ -18,6 +18,4 @@ There are a handful of third-party GUI tools that provide analytics on the top o
 
 - [Ride-the-Lightning](https://www.ridethelightning.info/)
 - [Umbrel](https://getumbrel.com/)
-- [bolt.observer](https://bolt.observer)
-- [LN Node Insights](https://lnnodeinsight.com/)
 - [Munin](https://github.com/lduchosal/munin-clightning)