Fix for twitter cards (#34)

Signed-off-by: Mary Anthony <mary@blockstack.com>

_config.yml

@@ -57,7 +57,9 @@ social:
     youtube:
 
 # Twitter share button
-twitter_username:
+twitter:
+  username: blockstack
+  image: /assets/img/touch-icon.png
 
 # Default footer image settings
 footer:
@@ -147,6 +149,7 @@ defaults:
       path: "" # an empty string here means all files in the project
     values:
       comments: true
+      image: /assets/img/touch-icon.png
 
 collections:
   android:

_develop/zero_to_dapp_1.md

@@ -1,6 +1,7 @@
 ---
 layout: learn
 permalink: /:collection/:path.html
+image: /assets/img/zero-to-dapp.png
 ---
 # 1 - Why Blockchain and Blockstack?
 {:.no_toc}

_develop/zero_to_dapp_2.md

@@ -1,6 +1,7 @@
 ---
 layout: learn
 permalink: /:collection/:path.html
+image: /assets/img/zero-to-dapp.png
 ---
 # 2 - Discover how DApps are different
 {:.no_toc}

_develop/zero_to_dapp_3.md

@@ -1,6 +1,7 @@
 ---
 layout: learn
 permalink: /:collection/:path.html
+image: /assets/img/zero-to-dapp.png
 ---
 # 3 - Build an Animal Kingdom DApp
 {:.no_toc}

_develop/zero_to_dapp_3_win.md

@@ -1,6 +1,7 @@
 ---
 layout: learn
 permalink: /:collection/:path.html
+image: /assets/img/zero-to-dapp.png
 ---
 # 3. Build an Animal Kingdom DApp
 {:.no_toc}

_develop/zero_to_dapp_4.md

@@ -1,6 +1,7 @@
 ---
 layout: learn
 permalink: /:collection/:path.html
+image: /assets/img/zero-to-dapp.png
 ---
 # 4 - Participate in App Mining
 {:.no_toc}

_includes/head.html

@@ -4,8 +4,8 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>{{ page.title | escape }}</title>
   {% seo title=false %}
-  <!-- <meta property="og:image" content="{% if site.brand.image contains 'http' %}{{ site.brand.image }}{% else %}{{ site.post_assets | absolute_url }}{{ site.brand.image }}{% endif %}"/> -->
+  <!-- <meta property="og:image" content="{% if site.brand.image contains 'http' %}{{ site.brand.image }}{% else %}{{ site.post_assets | url }}{{ site.brand.image }}{% endif %}"/> -->
-  <meta property="og:image" content="{% if site.brand.image contains 'http' %}{{ site.brand.image }}{% else %}{{ site.post_assets | url }}{{ site.brand.image }}{% endif %}"/>
+  <meta property="og:image" content="{{ "/assets/img/touch-icon.png" | relative_url }}"/>
   <link rel="stylesheet" href="{{ "/assets/css/main.css" | relative_url }}">
   <link rel="shortcut icon" type="image/png" href="{{ "assets/img/touch-icon.png" | relative_url }}" >
   <link rel="alternate" type="application/rss+xml" title="{{ site.title | escape }}" href="{{ "/feed.xml" | relative_url }}">

_includes/share.html

@@ -1,3 +1,3 @@
 <div class="share uk-text-center">
-    <a href="https://twitter.com/intent/tweet?text={{ page.title }}&url={{ site.url }}{{ page.url }}&via={{ site.twitter_username }}&related={{ site.twitter_username }}" rel="nofollow" target="_blank" title="Share on Twitter" onclick="window.open(this.href, 'twitter', 'width=550,height=235');return false;"><span data-uk-icon="icon: twitter; ratio: 1.2"></span></a>
+    <a href="https://twitter.com/intent/tweet?text={{ page.title }}&url={{ site.url }}{{ page.url }}&via={{ site.twitter.username }}&related={{ site.twitter_username }}" rel="nofollow" target="_blank" title="Share on Twitter" onclick="window.open(this.href, 'twitter', 'width=550,height=235');return false;"><span data-uk-icon="icon: twitter; ratio: 1.2"></span></a>
 </div>

robots.txt

@@ -0,0 +1,5 @@
+# www.robotstxt.org/
+# www.google.com/support/webmasters/bin/answer.py?hl=en&answer=156449
+
+User-agent: *
+Sitemap: https://docs.blockstack.org/sitemap.xml