Custom ordering for docs

I only really ordered the top level nav and installation, others could be customized if desired.
Shorten the header to LibreNMS Docs, so the menu stays nice on smaller screens, maybe even should shorten it to LibreNMS
Add some links on the index.md page

mkdocs.yml

@@ -1,4 +1,4 @@
-site_name: LibreNMS Documentation
+site_name: LibreNMS Docs
 theme: mkdocs
 docs_dir: doc
 site_dir: out
@@ -12,3 +12,80 @@ site_author: LibreNMS
 site_description: LibreNMS user and developer documentation
 repo_url: https://github.com/librenms/librenms
 repo_name: GitHub
+pages:
+- Home: index.md
+- Installation:
+    - Installing LibreNMS: Installation/Installing-LibreNMS.md
+    - Ubuntu VM Image: Installation/Ubuntu-image.md
+    - CentOS VM Image: Installation/CentOS-image.md
+    - Ubuntu 16.04 (Nginx): Installation/Installation-Ubuntu-1604-Nginx.md
+    - Ubuntu 16.04 (Apache): Installation/Installation-Ubuntu-1604-Apache.md
+    - CentOS 7 (Nginx): Installation/Installation-CentOS-7-Nginx.md
+    - CentOS 7 (Apache): Installation/Installation-CentOS-7-Apache.md
+    - Older Docs: Installation/Installing-LibreNMS.md
+#    - Ubuntu 14.04 (Nginx): Installation/Installation-Ubuntu-1404-Nginx.md
+#    - Ubuntu 14.04 (Apache): Installation/Installation-Ubuntu-1404-Apache.md
+#    - Ubuntu 14.04 (Lighttpd): Installation/Installation-Ubuntu-1404-Lighttpd.md
+#    - CentOS 6 (Apache/Nginx): Installation/Installation-CentOS-6-Apache-Nginx.md
+    - Migrating from Observium: Installation/Migrating-from-Observium.md
+- General:
+    - General/Acknowledgement.md
+    - General/Callback-Stats-and-Privacy.md
+    - General/Changelog.md
+    - General/Contributing.md
+    - General/Credits.md
+    - General/Updating.md
+    - General/Welcome-to-Observium-users.md
+    - General/Welcome-to-Observium-users.md
+- Extensions:
+    - Extensions/Alerting.md
+    - Extensions/Applications.md
+    - Extensions/Authentication.md
+    - Extensions/Auto-Discovery.md
+    - Extensions/Billing-Module.md
+    - Extensions/Component.md
+    - Extensions/Dell-OpenManage.md
+    - Extensions/Device-Groups.md
+    - Extensions/Distributed-Poller.md
+    - Extensions/Email-Alerting.md
+    - Extensions/Globe-Frontpage.md
+    - Extensions/Graylog.md
+    - Extensions/IRC-Bot.md
+    - Extensions/IRC-Bot-Extensions.md
+    - Extensions/InfluxDB.md
+    - Extensions/Interface-Description-Parsing.md
+    - Extensions/MIB-based-polling.md
+    - Extensions/Memcached.md
+    - Extensions/Network-Map.md
+    - Extensions/Oxidized.md
+    - Extensions/Plugin-System.md
+    - Extensions/Poller-Service.md
+    - Extensions/Port-Description-Parser.md
+    - Extensions/Proxmox.md
+    - Extensions/RRDCached.md
+    - Extensions/RRDTune.md
+    - Extensions/SNMP-Proxy.md
+    - Extensions/SNMP-Trap-Handler.md
+    - Extensions/Services.md
+    - Extensions/Smokeping.md
+    - Extensions/Sub-Directory.md
+    - Extensions/Syslog.md
+    - Extensions/Two-Factor-Auth.md
+    - Extensions/Varnish.md
+- Developing:
+    - Developing/Code-Guidelines.md
+    - Developing/Code-Structure.md
+    - Developing/Dynamic-Config.md
+    - Developing/Sensor-State-Support.md
+    - Developing/Style-Guidelines.md
+    - Developing/Using-Git.md
+- API: API/API-Docs.md
+- Support:
+    - Support/Configuration.md
+    - Support/Discovery Support.md
+    - Support/FAQ.md
+    - Support/Features.md
+    - Support/Install Validation.md
+    - Support/Performance.md
+    - Support/Poller Support.md
+    - Support/Support-New-OS.md