docs: beef up entrypoint documentation page

Let's use the rough categorization of the markdown pages to add basic
sections, via Jeykll templating. Also, add in a couple of additional
links via a JSON array that lists them.

So much web development, so much wow!

1 files changed, 9 insertions, 3 deletions

diff --git a/docs/index.md b/docs/index.md
index ffb30b9634..2969162a2a 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -4,8 +4,14 @@ title: systemd Documentation
 
 # systemd Documentation
 
-{% for p in site.pages %}
-  {% if p.url != page.url and p.title %}
-* [{{ p.title }}]({{ p.url | relative_url }})
+{% assign by_category = site.pages | group_by:"category" %}
+{% assign extra_pages = site.data.extra_pages | group_by:"category" %}
+{% assign merged = by_category | concat: extra_pages | sort:"name" %}
+
+{% for pair in merged %}
+  {% if pair.name != "" %}
+## {{ pair.name }}
+{% assign sorted = pair.items | sort:"title" %}{% for page in sorted %}
+* [{{ page.title }}]({{ page.url | relative_url }}){% endfor %}
   {% endif %}
 {% endfor %}