Adding OnCall to top menu, along with icons

Author: rcastley

content/en/apm/_index.md

@@ -7,6 +7,7 @@ cascade:
 menu:
   main:
     weight: 2
+    pre: <i class='fa-solid fa-code-fork'></i>
 ---
 
 Splunk APM is a NoSample™ Full-fidelity application performance monitoring and troubleshooting solution for cloud-native, microservices-based applications.

content/en/imt/_index.md

@@ -7,6 +7,7 @@ weight: 1
 menu:
   main:
     weight: 1
+    pre: <i class='fa-regular fa-sitemap'></i>
 ---
 
 During this _**technical**_ Splunk Observability Cloud Infrastructure Monitoring and APM Workshop you will build out an environment based on a [lightweight](https://k3s.io/) Kubernetes[^1] cluster.

content/en/oncall/_index.md

@@ -4,6 +4,10 @@ linkTitle: Splunk OnCall
 weight: 1
 cascade:
   type: docs
+menu:
+  main:
+    weight: 5
+    pre: <i class="fa-regular fa-phone-flip"></i>
 ---
 
 ## Aim

content/en/rum/_index.md

@@ -7,6 +7,8 @@ cascade:
 menu:
   main:
     weight: 4
+    pre: <i class='fa-regular fa-chalkboard-user'></i>
+
 ---
 
 Splunk RUM is the industry’s only end to end, full fidelity Real User Monitoring solution. It is built to optimize performance and aid in faster troubleshooting, giving you full visibility into end-user experiences.

content/en/synthetics/_index.md

@@ -7,6 +7,7 @@ cascade:
 menu:
   main:
     weight: 3
+    pre: <i class='fa-brands fa-chrome'></i>
 ---
 
 **Splunk Synthetic Monitoring** offers the most comprehensive and in-depth capabilities for uptime and web performance optimization as part of the only complete observability suite, Splunk Observability Cloud.