Update api-and-services page about package indices

Add a link to the dashboard sub-section where we generate and store the
Apertis package indices, per release, in TSV format

Signed-off-by: Ritesh Raj Sarraf <ritesh.sarraf@collabora.com>

content/architecture/apis-and-services.md

@@ -140,6 +140,11 @@ system to provide the basic UI even if there are no user focused applications:
 - [systemd](https://www.freedesktop.org/wiki/Software/systemd/): Service manager
 - [OSTree](http://ostree.readthedocs.io/): Atomic software updates
 
+## Full package index
+
+[source package indices](https://infrastructure.pages.apertis.org/dashboard/tsv/index.html):
+Full package list in TSV format, categorized under different repository components, per platform release
+
 # UI Framework
 
 ## Provides