docs: standardizing installation doc titles

docs/getting-started/install/azure.md

@@ -1,4 +1,4 @@
-# Microsoft Azure
+# Microsoft Azure Installation Notes
 
 1. If you don't already have one [generate an SSH key pair](https://help.github.com/articles/generating-ssh-keys/).
 

docs/getting-started/install/digitalocean.md

@@ -1,4 +1,4 @@
-# DigitalOcean Droplet
+# DigitalOcean Droplet Installation Notes
 
 [DigitalOcean](https://www.digitalocean.com/products/compute/) offers a pre-installed Dokku image. You can run this image on any sized Droplet, although larger Droplets will allow you to run larger applications.
 

docs/getting-started/install/dreamhost.md

@@ -1,4 +1,4 @@
-# Install Dokku on DreamHost Cloud Server with cloud-init
+# DreamHost Cloud Server Installation Notes
 
 Cloud-init script can be used to automate installation of Dokku on
 Dreamhost (or any other OpenStack-compatible cloud with minimal

docs/getting-started/install/vagrant.md

@@ -1,4 +1,4 @@
-# Install Dokku using Vagrant
+# Vagrant Installation Notes
 
 1. Download and install [VirtualBox](https://www.virtualbox.org/wiki/Downloads).