Minor doc reorganization. (#2453)

* Move templates into .github folder, in preparation for more.

* Update README to fix links geneated by Jazzy.

README.md

@@ -15,16 +15,16 @@ Alamofire is an HTTP networking library written in Swift.
 - [Migration Guides](#migration-guides)
 - [Communication](#communication)
 - [Installation](#installation)
-- [Usage](Documentation/Usage.md)
-    - **Intro -** [Making a Request](Documentation/Usage.md#making-a-request), [Response Handling](Documentation/Usage.md#response-handling), [Response Validation](Documentation/Usage.md#response-validation), [Response Caching](Documentation/Usage.md#response-caching)
-	- **HTTP -** [HTTP Methods](Documentation/Usage.md#http-methods), [Parameter Encoding](Documentation/Usage.md#parameter-encoding), [HTTP Headers](Documentation/Usage.md#http-headers), [Authentication](Documentation/Usage.md#authentication)
-	- **Large Data -** [Downloading Data to a File](Documentation/Usage.md#downloading-data-to-a-file), [Uploading Data to a Server](Documentation/Usage.md#uploading-data-to-a-server)
-	- **Tools -** [Statistical Metrics](Documentation/Usage.md#statistical-metrics), [cURL Command Output](Documentation/Usage.md#curl-command-output)
-- [Advanced Usage](Documentation/AdvancedUsage.md)
-	- **URL Session -** [Session Manager](Documentation/AdvancedUsage.md#session-manager), [Session Delegate](Documentation/AdvancedUsage.md#session-delegate), [Request](Documentation/AdvancedUsage.md#request)
-	- **Routing -** [Routing Requests](Documentation/AdvancedUsage.md#routing-requests), [Adapting and Retrying Requests](Documentation/AdvancedUsage.md#adapting-and-retrying-requests)
-	- **Model Objects -** [Custom Response Serialization](Documentation/AdvancedUsage.md#custom-response-serialization)
-	- **Connection -** [Security](Documentation/AdvancedUsage.md#security), [Network Reachability](Documentation/AdvancedUsage.md#network-reachability)
+- [Usage](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md)
+    - **Intro -** [Making a Request](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#making-a-request), [Response Handling](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#response-handling), [Response Validation](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#response-validation), [Response Caching](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#response-caching)
+	- **HTTP -** [HTTP Methods](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#http-methods), [Parameter Encoding](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#parameter-encoding), [HTTP Headers](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#http-headers), [Authentication](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#authentication)
+	- **Large Data -** [Downloading Data to a File](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#downloading-data-to-a-file), [Uploading Data to a Server](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#uploading-data-to-a-server)
+	- **Tools -** [Statistical Metrics](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#statistical-metrics), [cURL Command Output](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#curl-command-output)
+- [Advanced Usage](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md)
+	- **URL Session -** [Session Manager](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#session-manager), [Session Delegate](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#session-delegate), [Request](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#request)
+	- **Routing -** [Routing Requests](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#routing-requests), [Adapting and Retrying Requests](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#adapting-and-retrying-requests)
+	- **Model Objects -** [Custom Response Serialization](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#custom-response-serialization)
+	- **Connection -** [Security](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#security), [Network Reachability](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#network-reachability)
 - [Open Radars](#open-radars)
 - [FAQ](#faq)
 - [Credits](#credits)