Add docsite for version 0.8

docsite/source/index.html.md

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+---
+title: Introduction & Usage
+description: Thread-safe configuration mixin
+layout: gem-single
+order: 7
+type: gem
+name: dry-configurable
+sections:
+  - testing
+---
+
+### Introduction
+
+`dry-configurable` is a simple mixin to add thread-safe configuration behaviour to your classes. There are many libraries that make use of configuration, and each seemed to have their own implementation with a similar or duplicate interface, so we thought it was strange that this behaviour had not already been encapsulated into a reusable gem, hence `dry-configurable` was born.
+
+### Usage
+
+`dry-configurable` is extremely simple to use, just extend the mixin and use the `setting` macro to add configuration options:
+
+```ruby
+class App
+  extend Dry::Configurable
+
+  # Pass a block for nested configuration (works to any depth)
+  setting :database do
+    # Can pass a default value
+    setting :dsn, 'sqlite:memory'
+  end
+  # Defaults to nil if no default value is given
+  setting :adapter
+  # Pre-process values
+  setting(:path, 'test') { |value| Pathname(value) }
+  # Passing the reader option as true will create attr_reader method for the class
+  setting :pool, 5, reader: true
+  # Passing the reader attributes works with nested configuration
+  setting :uploader, reader: true do
+    setting :bucket, 'dev'
+  end
+end
+
+App.config.database.dsn
+# => "sqlite:memory"
+
+App.config.database.dsn = 'jdbc:sqlite:memory'
+App.config.database.dsn
+# => "jdbc:sqlite:memory"
+App.config.adapter
+# => nil
+App.config.path
+# => #<Pathname:test>
+App.pool
+# => 5
+App.uploader.bucket
+# => 'dev'
+```

docsite/source/testing.html.md

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+---
+title: Testing
+layout: gem-single
+name: dry-configurable
+---
+
+### How to reset the config to its original state on testing environment
+
+update `spec_helper.rb` :
+
+```ruby
+require "dry/configurable/test_interface"
+
+# this is your module/class that extended by Dry::Configurable
+module AwesomeModule
+  enable_test_interface
+end
+```
+
+and on spec file (`xxx_spec.rb`) :
+
+```ruby 
+before(:all) { AwesomeModule.reset_config }
+# or 
+before(:each) { AwesomeModule.reset_config }
+
+```