grafana: Fix disabled dashboards provisioning due to duplicates

Symlinking home.json to archive.json causes a duplicate, as both
dashboards have the same uid, and Grafana won't keep the dashboards
updated when there are duplicates[1]. Instead just change
default_home_dashboard_path to point to the archive.json dashboard.

[1] "dashboards provisioning provider has no database write permissions
     because of duplicates"

roles/grafana/files/public-dashboards/home.json

-archive.json
\ No newline at end of file

roles/grafana/templates/grafana.ini.j2

@@ -352,7 +352,7 @@ strict_transport_security_max_age_seconds = 86400
 
 # Path to the default home dashboard. If this value is empty, then Grafana uses StaticRootPath + "dashboards/home.json"
 {% if grafana_anonymous_access %}
-default_home_dashboard_path = /var/lib/grafana/public-dashboards/home.json
+default_home_dashboard_path = /var/lib/grafana/public-dashboards/archive.json
 {% else %}
 ;default_home_dashboard_path =
 {% endif %}