docs: Fix page ordering

docs/cloud-agents.md

@@ -1,8 +1,8 @@
-# Project CentOS boot tier-1 and cloud agents
+---
+nav_order: 4
+---
 
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-nav_order: 2
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+# Project CentOS boot tier-1 and cloud agents
 
 The tier-0 and tier-1 images today do not contain any special
 hypervisor-specific agents.  The following specifically are not included

docs/coreos.md

@@ -1,8 +1,8 @@
-# Relationship with CoreOS
+---
+nav_order: 2
+---
 
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-nav_order: 5
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+# Relationship with CoreOS
 
 The CoreOS Container Linux project was very successful, spawning multiple projects
 and derivatives that continue to see widespread use today.

docs/install.md

@@ -1,9 +1,9 @@
-# Trying out development builds
-
 ---
 nav_order: 2
 ---
 
+# Trying out development builds
+
 ## Operating system state (users, ssh keys)
 
 It's absolutely crucial to understand that the container image *is* the