Fix missing titles on website docs.

Also fixes our sitemap to have correct `lastmod` times when built locally (it was already correct on Netlify).

Signed-off-by: Matt Moyer <moyerm@vmware.com>

site/config.yaml

@@ -32,3 +32,5 @@ related:
     weight: 50
   threshold: 0
   toLower: true
+
+enableGitInfo: true

site/content/docs/_index.md

@@ -1,4 +1,5 @@
 ---
+title: Getting Started with Pinniped
 cascade:
   layout: docs
 menu:
@@ -7,8 +8,6 @@ menu:
     weight: 1
 ---
 
-# Getting started with Pinniped
-
 Pinniped is an authentication service for Kubernetes clusters.
 As a Kubernetes cluster administrator or user, you can learn how Pinniped works, see how to use it on your clusters, and dive into internals of Pinniped's APIs and architecture.
 

site/content/docs/background/_index.md

@@ -1,4 +1,5 @@
 ---
+title: Pinniped Background
 cascade:
   layout: docs
 menu:
@@ -8,6 +9,4 @@ menu:
     weight: 110
 ---
 
-# Pinniped background
-
 {{< docsmenu "background" >}}

site/content/docs/reference/_index.md

@@ -1,4 +1,5 @@
 ---
+title: Pinniped Reference
 cascade:
   layout: docs
 menu:
@@ -8,6 +9,4 @@ menu:
     weight: 100
 ---
 
-# Pinniped reference
-
 {{< docsmenu "reference" >}}

site/content/docs/tutorials/_index.md

@@ -1,4 +1,5 @@
 ---
+title: Pinniped Tutorials
 cascade:
   layout: docs
 menu:
@@ -8,8 +9,6 @@ menu:
     weight: 40
 ---
 
-# Pinniped tutorials
-
 These tutorials demonstrate how to use the Pinniped command-line tool, Concierge, and Supervisor:
 
 {{< docsmenu "tutorials" >}}