Add minima gem to Gemfile for enhanced styling

Author: cleberhensel

Gemfile

@@ -4,6 +4,7 @@ gem "jekyll", "~> 4.3"
 gem "jekyll-feed", "~> 0.15"
 gem "jekyll-sitemap", "~> 1.4"
 gem "jekyll-seo-tag", "~> 2.8"
+gem "minima", "~> 2.5"
 
 platforms :mingw, :x64_mingw, :mswin, :jruby do
   gem "tzinfo", ">= 1", "< 3"