website: update homepage copy

website/Gemfile.lock

@@ -175,6 +175,3 @@ PLATFORMS
 
 DEPENDENCIES
   middleman-hashicorp!
-
-BUNDLED WITH
-   1.10.2

website/source/index.html.erb

@@ -10,7 +10,7 @@ description: |-
 		<div class="row">
 			<div class="col-md-4 col-md-offset-1">
 				<h2>
-					<span class="text-green">Packer</span> is a tool for creating identical machine images for multiple platforms from a single source configuration.
+					<span class="text-green">Packer</span> is a tool for creating machine and container images for multiple platforms from a single source configuration.
 				</h2>
 			</div>
 		</div>
@@ -58,7 +58,7 @@ description: |-
 				<h2 class="text-green text-center">Works Great With</h2>
 				<p>
 					Out of the box Packer comes with support to build images for
-					Amazon EC2, DigitalOcean, Google Compute Engine, QEMU,
+					Amazon EC2, DigitalOcean, Docker, Google Compute Engine, QEMU,
 					VirtualBox, VMware, and more. Support for
 					more platforms is on the way, and anyone can add new platforms
 					via plugins.