[Spectrum & WR] Review overview pages (#16796)

* Review Spectrum overview pages

* Review Waiting Room overview pages

Author: angelampcosta

src/content/docs/spectrum/about/index.mdx

@@ -3,6 +3,8 @@ title: About
 pcx_content_type: navigation
 sidebar:
   order: 3
+  group:
+    hideIndex: true
 
 ---
 

src/content/docs/spectrum/how-to/index.mdx

@@ -3,6 +3,8 @@ title: How to
 pcx_content_type: navigation
 sidebar:
   order: 5
+  group:
+    hideIndex: true
 
 ---
 

src/content/docs/spectrum/reference/index.mdx

@@ -3,6 +3,8 @@ title: Reference
 pcx_content_type: navigation
 sidebar:
   order: 6
+  group:
+    hideIndex: true
 
 ---
 

src/content/docs/waiting-room/additional-options/index.mdx

@@ -3,6 +3,8 @@ pcx_content_type: navigation
 title: Additional options
 sidebar:
   order: 5
+  group:
+    hideIndex: true
 
 ---
 

src/content/docs/waiting-room/how-to/index.mdx

@@ -3,6 +3,8 @@ title: How to
 pcx_content_type: navigation
 sidebar:
   order: 4
+  group:
+    hideIndex: true
 head:
   - tag: title
     content: Common tasks

src/content/docs/waiting-room/plans/index.mdx renamed to src/content/docs/waiting-room/plans.mdx

@@ -3,6 +3,8 @@ pcx_content_type: navigation
 title: Reference
 sidebar:
   order: 7
+  group:
+    hideIndex: true
 
 ---