Add summary info and update home page

Author: panesofglass

heroes.html

@@ -2,6 +2,7 @@
 title: Heroes
 layout: default
 order: 4
+summary: View the Community for F# award recipients.
 ---
 
 <article id="heroes">

index.html

@@ -4,12 +4,13 @@
 order: null
 ---
 
-<article class="card-group">
+<article class="row">
     {% assign mypages = site.pages | sort: "order" %}
     {% for page in mypages %}
     {% if page.order != null %}
-    <section class="card text-center card-body">
+    <section class="col-sm-6 card text-center card-body">
         <h1 class="card-title">{{ page.title }}</h1>
+        <p class="card-body">{{ page.summary }}</p>
         <a href="{{ page.url | relative_url }}" title="{{ page.title }}" class="btn btn-amber">Go</a>
     </section>
     {% endif %}

learning.html

@@ -2,6 +2,7 @@
 title: Learning
 layout: default
 order: 3
+summary: Explore dojos, workshops, and more.
 ---
 
 <article id="fsharp-coding-dojos">

project-ideas.md

@@ -2,6 +2,7 @@
 title: Project Ideas
 layout: default
 order: 5
+summary: Review proposed projects and learn how to propose one of your own.
 ---
 
 # {{ page.title }}

videos.html

@@ -2,6 +2,7 @@
 title: Videos
 layout: default
 order: 2
+summary: View recorded presentations.
 ---
 
 <article id="online-presentations">