Restructure the Ubuntu Getting Started Section.

- This supercedes PR #1770
 - This breaks up the section from one huge installation page into:
   - A new index page.
   - New support grid with commercial and community support options.
   - Move to lifecycle-based pages based on operational tasks.
     - Add support for local deployments via LXD.
       - Added screenshots to images/docs/ubuntu
     - Add backup page.
     - Add decommissioning page.
     - Add a glossary of terms page.
     - Rewritten installation page.
     - Add logging page.
     - Add monitoring page.
     - Add networking page, flannel only for now, calico in progress.
     - Add a scaling page.
     - Add a security page.
     - Add a storage page.
     - Add a troubleshooting page.
     - Add an upgrade page.
     - Add a cluster validation page.
     - Add new ubuntu content to the index page.
       - Add Ubuntu to _data TOC.
     - Add warning about choosing ipv6 with LXD, thanks Ed Baluf.
     - Template-ize all the pages per jaredb's review.

docs/getting-started-guides/ubuntu/logging.md

@@ -0,0 +1,20 @@
+---
+Title: Logging
+---
+
+{% capture overview %}
+This page will explain how logging works within a Juju deployed cluster.
+{% endcapture %}
+
+{% capture prerequisites %}
+This page assumes you have a working Juju deployed cluster.
+{% endcapture %}
+
+
+## Agent Logging
+
+The `juju debug-log` will show all of the consolidated logs of all the Juju agents running on each node of the cluster. This can be useful for finding out why a specific node hasn't deployed or is in an error state. These agent logs are located in `/var/lib/juju/agents` on every node. 
+
+See the [Juju documentation](https://jujucharms.com/docs/stable/troubleshooting-logs) for more information.
+
+