Remove dependency on tent-apidoc

lib/api_example.rb

@@ -1,9 +1,11 @@
-require 'tent-apidoc'
+require 'yaml'
 
 class ApiExampleFilter < Nanoc::Filter
   identifier :api_example
   type :text
 
+  DATA = YAML.load(File.read('content/docs/api_examples.yaml'))
+
   def run(content, params={})
     content.gsub(/\{(\w+) example\}/) { api_example($1) }.gsub(/\{(\w+) var\}/) { api_var($1) }
   end
@@ -11,10 +13,10 @@ class ApiExampleFilter < Nanoc::Filter
   private
 
   def api_example(id)
-    TentApiDoc.examples[id.to_sym]
+    DATA[:examples][id.to_sym]
   end
 
   def api_var(id)
-    TentApiDoc.variables[id.to_sym]
+    DATA[:variables][id.to_sym]
   end
 end