Publish prometheus metric pages (#37305)

Publishes prometheus metric documentation pages

Fixes
https://linear.app/materializeinc/issue/DEP-13/auto-generate-metrics-documentation

Author: SangJunBak

doc/user/content/manage/monitor/appendix-metrics.md

@@ -3,12 +3,11 @@ title: "Appendix: Metrics"
 description: "Reference list of the Prometheus metrics exposed by Materialize."
 disable_toc: true
 disable_list: true
-# TODO (SangJunBak): Unhide once ready to publish
-# menu:
-#   main:
-#     parent: "monitor"
-#     identifier: "monitor-appendix-metrics"
-#     weight: 20
+menu:
+  main:
+    parent: "monitor"
+    identifier: "monitor-appendix-metrics"
+    weight: 20
 ---
 
 This page lists the Prometheus metrics exposed by Materialize, along with their

doc/user/content/manage/monitor/essential-metrics.md

@@ -2,12 +2,11 @@
 title: "Essential metrics"
 description: "The Prometheus metrics Materialize recommends building dashboards and alerts on."
 disable_list: true
-# TODO (SangJunBak): Unhide once ready to publish
-# menu:
-#   main:
-#     parent: "monitor"
-#     identifier: "monitor-essential-metrics"
-#     weight: 19
+menu:
+  main:
+    parent: "monitor"
+    identifier: "monitor-essential-metrics"
+    weight: 19
 ---
 
 This page lists the essential Prometheus metrics exposed by Materialize: the