Homepage edits, Update sidebar layout content/styles, and Add community page

www/config.rb

@@ -36,7 +36,7 @@
 helpers SidebarHelpers
 
 helpers do
-  def nav_class
+  def layout_class
     layout = current_page.options.fetch(:layout, nil)
     layout == :sidebar ? 'has-sidebar' : ''
   end

www/source/about/index.html.slim

@@ -37,12 +37,8 @@ p
     Networks grep rsync diff. chmod cron sideband demultiplexer rbash push
     preview environment SQL Varnish pub key
 hr
-p
-  small Continue to the next topic
-  br
-  a href="#" Who should use habitat?
-hr
-p
-  small
-    | Copyright: This work is licensed under xxxxx <br/>
-      Provide feedback on habitat documentation.
+ul.main-content--link-nav
+  li Continue to the next article
+  li
+    a href="/docs/package-contents" Package contents
+

www/source/community.html.slim

@@ -0,0 +1,53 @@
+---
+title: Community
+classes: community
+---
+section.hero.community
+  .row
+    .columns.medium-12
+      .hero--content
+        h1.hero--heading Let's build together
+        p.hero--text
+          | Habitat is an open source project created and supported
+            by a passionate group of humans. Our visions are grand as
+            we believe this tool has the potential to bring automation
+            to places previously unconsidered.
+        a.button.cta href="https://forums.habitat.sh/" Join the community
+    .hero--graphic
+      img[src="/images/graphics/hero-community.svg"
+        onerror="this.src='/images/graphics/hero-community.png'" alt=""]
+
+section.sub-hero.community
+  .row
+    .columns.medium-12
+      .sub-hero--content
+        h2.sub-hero--heading Looking for Habitat support?
+        .row
+          .sub-hero--blurb.columns.medium-4
+            img.sub-hero--icon[src="/images/icons/subhero-manage.svg"
+              onerror="this.src='/icons/subhero-manage.png'" alt=""]
+            h4 Get answers
+            p
+              | Is something unclear or just feeling stuck? We're here
+                to help keep you moving.
+            a.button.outline href="https://forums.habitat.sh/" Ask a Question
+
+          .sub-hero--blurb.columns.medium-4
+            img.sub-hero--icon[src="/images/icons/subhero-results.svg"
+              onerror="this.src='/icons/subhero-results.png'" alt=""]
+            h4 Send feedback
+            p
+              | We rely on your feedback to improve Habitat and look
+                forward to hearing from you.
+            a.button.outline href="https://forums.habitat.sh/" Report an issue
+
+          .sub-hero--blurb.columns.medium-4
+            img.sub-hero--icon[src="/images/icons/subhero-results.svg"
+              onerror="this.src='/icons/subhero-results.png'" alt=""]
+            h4 Contribute to Habitat
+            p
+              | We're off to a good start but would appreciate your
+                expertise in building the core.
+            a.button.outline href="https://forums.habitat.sh/" Become a maintainer
+
+        img.sub-hero--graphic src="/images/graphics/subhero-watermark.png" alt=""