get rid of example_index check in index pages

Author: Joseph Damiba

_posts/ggplot2/2016-12-16-ggplot2-index.md

@@ -21,6 +21,6 @@ redirect_from: ggplot2/reference/
   </div>
 </header>
 
-{% assign languagelist = site.posts | where:"page_type","example_index" | where:"language","ggplot2"  | sort: "order"  %}
+{% assign languagelist = site.posts | where:"language","ggplot2"  | sort: "order"  %}
 
 {% include posts/documentation_eg.html %}

_posts/julia/2015-04-05-julia-index.html

@@ -27,6 +27,6 @@ <h1>Plotly Julia Library</h1>
 </header>
 
 	<h2>Documentation Examples</h2>
-		{% assign languagelist = site.posts | where:"page_type","example_index" | where:"language","julia" | sort: "order" %}
+		{% assign languagelist = site.posts | where:"language","julia" | sort: "order" %}
 
 		{% include posts/documentation_eg.html %}

_posts/matlab/2015-04-05-matlab-index.html

@@ -90,6 +90,6 @@ <h6>
 	<br>
 
 	<h2>Documentation Examples</h2>
-		{% assign languagelist = site.posts | where:"page_type","example_index" | where:"language","matlab"  | sort: "order" %}
+		{% assign languagelist = site.posts | where:"language","matlab"  | sort: "order" %}
 
 		{% include posts/documentation_eg.html %}

_posts/nodejs/2015-04-05-node_js-index.html

@@ -22,6 +22,6 @@ <h1>Plotly node.js Library</h1>
 	</div>
 </header>
 
-		{% assign languagelist = site.posts | where:"page_type","example_index" | where:"language","nodejs" | sort: order  %}
+		{% assign languagelist = site.posts | where:"language","nodejs" | sort: order  %}
 
 		{% include posts/documentation_eg.html %}

_posts/python/2019-07-03-index.html

@@ -34,5 +34,5 @@ <h1>Plotly Python Open Source Graphing Library</h1>
 
 
 
-		{% assign languagelist = site.posts | where:"page_type","example_index" | where:"language","python"  | sort: "order" %}
+		{% assign languagelist = site.posts | where:"language","python"  | sort: "order" %}
         {% include posts/documentation_eg.html %}

_posts/r/2015-07-30-r-index.md

@@ -25,6 +25,6 @@ language: r
 </header>
 
 
-{% assign languagelist = site.posts | where:"page_type","example_index" | where:"language","r"  | sort: "order"  %}
+{% assign languagelist = site.posts | where:"language","r"  | sort: "order"  %}
 
 {% include posts/documentation_eg.html %}

_posts/scala/2016-04-13-scala-index.html

@@ -24,6 +24,6 @@ <h1>Plotly Scala Library</h1>
 </header>
 
 
-{% assign languagelist = site.posts | where:"page_type","example_index" | where:"language","scala"  | sort: "order" %}
+{% assign languagelist = site.posts | where:"language","scala"  | sort: "order" %}
 
 {% include posts/documentation_eg.html %}