Set JEKYLL_ENV environment variable for Netlify builds (#267)

Author: Simran-B

_includes/topnav.html

@@ -19,7 +19,7 @@
       {%- else -%}
         {%- assign version_number = v.version.name -%}
       {%- endif -%}
-      {%- if v.version.tag -%}
+      {%- if v.version.tag and jekyll.environment != "netlify" -%}
         {%- assign version_alias = v.version.tag -%}
       {%- else -%}
         {%- assign version_alias = v.version.name -%}

_layouts/default.html

@@ -13,7 +13,7 @@
       <script type="text/javascript">
           var availableVersions = [
             {%- for v in page.versions -%}
-              {%- if v.version.tag -%}
+              {%- if v.version.tag and jekyll.environment != "netlify" -%}
                 {%- assign version_alias = v.version.tag -%}
               {%- else -%}
                 {%- assign version_alias = v.version.name -%}

netlify.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-jekyll build
+JEKYLL_ENV="netlify" jekyll build
 ruby sitemap.rb
 rm -rf htmltest
 mkdir -p htmltest