Clear contents of docs/ before regenerating

Author: EricFromCanada

Rakefile

@@ -5,6 +5,7 @@ task default: :yard
 
 desc "Generate documentation with YARD"
 task :yard do
+  sh "find", "docs", "-mindepth", "1", "!", "-name", "_config.yml", "!", "-name", "CNAME", "-delete"
   sh "bundle", "exec", "yard"
 end