Really enable jekyll-redirect-from

`safe` needs to be `false` to have the plugin in effect.

See https://talk.jekyllrb.com/t/jekyll-redirect-from-redirects-not-being-applied/1204

Author: BanzaiMan

Gemfile.lock

@@ -152,3 +152,6 @@ DEPENDENCIES
   rack-jekyll
   rack-ssl-enforcer
   rake
+
+BUNDLED WITH
+   1.10.6

_config.yml

@@ -1,7 +1,7 @@
 exclude: [bin, CNAME, Gemfile, Gemfile.lock, README.md, slate, vendor]
 markdown: kramdown
 permalink: :title
-safe: true
+safe: false
 syntax-highlighting:
   enabled: true
 kramdown:

user/customizing-the-build.md

@@ -188,7 +188,7 @@ one situation in which you might want to set a particular limit is:
   condition with concurrent builds.
 
 You can set the maximum number of concurrent builds in the settings pane for
-each repository.  
+each repository.
 
 ![Settings -> Limit concurrent builds](/images/screenshots/concurrent-builds-how-to.png)