Auto-generate child page indexes

This way when folks browse to the index pages they'll see an
auto-generated list of child pages.

Signed-off-by: Nic Cope <nicc@rk0n.org>

content/master/composition/_index.md

@@ -3,3 +3,5 @@ title: Composition
 weight: 51
 description: Understand Crossplane's core components
 ---
+
+{{< auto-index >}}

content/master/get-started/_index.md

@@ -4,3 +4,4 @@ weight: 40
 description: Get started with Crossplane.
 ---
 
+{{< auto-index >}}

content/master/guides/_index.md

@@ -2,4 +2,6 @@
 title: Guides
 weight: 100
 description: Crossplane integrations and detailed examples.
----
+---
+
+{{< auto-index >}}

content/master/managed-resources/_index.md

@@ -3,3 +3,5 @@ title: Managed Resources
 weight: 52
 description: Understand Crossplane's managed resources and selective activation
 ---
+
+{{< auto-index >}}

content/master/operations/_index.md

@@ -5,3 +5,5 @@ state: alpha
 alphaVersion: 2.0
 description: Understand Crossplane's Operations feature
 ---
+
+{{< auto-index >}}

content/master/packages/_index.md

@@ -3,3 +3,5 @@ title: Packages
 weight: 53
 description: Understand Crossplane's core components
 ---
+
+{{< auto-index >}}

themes/geekboot/layouts/partials/auto-index.html

@@ -0,0 +1,14 @@
+{{/*
+Auto-generates an index page with links to child pages, ordered by weight.
+Usage: {{ partial "auto-index" . }}
+*/}}
+{{ if .RegularPages }}
+<div class="auto-index">
+  <p>Topics in this section:</p>
+  <ul>
+  {{ range .RegularPages.ByWeight }}
+    <li><a href="{{ .Permalink }}">{{ .Title }}</a>{{ if .Params.description }} - {{ .Params.description }}{{ end }}</li>
+  {{ end }}
+  </ul>
+</div>
+{{ end }}

themes/geekboot/layouts/shortcodes/auto-index.html

@@ -0,0 +1,5 @@
+{{/*
+Shortcode to auto-generate an index of child pages.
+Usage: {{< auto-index >}}
+*/}}
+{{ partial "auto-index" .Page }}