Adds Jekyll remote theme configuration, removes local theme configura…

…tion

Note that local builds now throw invalid warnings as noted in: jekyll/jekyll#7630

Gemfile

@@ -20,6 +20,7 @@ gem "just-the-docs", "~> 0.2.5"
 # If you have any plugins, put them here!
 group :jekyll_plugins do
   # gem "jekyll-feed", "~> 0.6"
+  gem "jekyll-remote-theme"
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem

_config.yml

@@ -23,10 +23,8 @@ permalink: pretty
 # Build settings
 markdown: kramdown
 remote_theme: pmarsceill/just-the-docs
-theme: just-the-docs
 
 # Kramdown settings
-
 kramdown:
   toc_levels: 2..3
 
@@ -44,6 +42,9 @@ ga_tracking: UA-135423944-1
 # Adds on-hover anchor links to h2-h6
 anchor_links: true
 
+plugins:
+  - jekyll-remote-theme
+
 # Exclude from processing.
 # The following items will not be processed, by default. Create a custom list
 # to override the default setting.