Remove the customize redirect. (#28270)

The current `baseurl` makes this wrong.

Gemfile

@@ -2,7 +2,6 @@ source 'https://rubygems.org'
 
 group :development, :test do
   gem 'jekyll', '~> 3.8.5'
-  gem 'jekyll-redirect-from', '~> 0.14.0'
   gem 'jekyll-sitemap', '~> 1.2.0'
   gem 'wdm', '~> 0.1.1', :install_if => Gem.win_platform?
 end

Gemfile.lock

@@ -29,8 +29,6 @@ GEM
       pathutil (~> 0.9)
       rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-    jekyll-redirect-from (0.14.0)
-      jekyll (~> 3.3)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
     jekyll-sitemap (1.2.0)
@@ -66,7 +64,6 @@ PLATFORMS
 
 DEPENDENCIES
   jekyll (~> 3.8.5)
-  jekyll-redirect-from (~> 0.14.0)
   jekyll-sitemap (~> 1.2.0)
   wdm (~> 0.1.1)
 

_config.yml

@@ -17,7 +17,6 @@ exclude:
   - assets/less/
 
 plugins:
-  - jekyll-redirect-from
   - jekyll-sitemap
 
 # Custom vars

docs/customize.html

@@ -3,7 +3,6 @@ layout: default
 title: Customize and download
 slug: customize
 lead: Customize Bootstrap's components, Less variables, and jQuery plugins to get your very own version. Requires IE9+ or latest Safari, Chrome, or Firefox.
-redirect_from: "/docs/3.3/customize/"
 ---