Remove reference to Azure Application Insights

Closes gh-31889

Author: snicoll

spring-boot-project/spring-boot-starters/README.adoc

@@ -52,9 +52,6 @@ do as they were designed before this was clarified.
 | https://azure.microsoft.com/[Azure]
 | https://github.com/Microsoft/azure-spring-boot-starters
 
-| https://docs.microsoft.com/en-us/azure/application-insights/app-insights-overview[Azure Application Insights]
-| https://github.com/Microsoft/ApplicationInsights-Java/tree/master/azure-application-insights-spring-boot-starter
-
 | https://github.com/bitcoin/bitcoin[Bitcoin]
 | https://github.com/theborakompanioni/bitcoin-spring-boot-starter