Static file serving support for the Website service (#3)

This PR contains the work done to support the static files serving for the **Website** service, and also included the essential boilerplate assets from the **HTML5 boilerplate** project.

To provide further details about the work done:

* Serving: Added the `FileMiddleware` middlewqare to the router; `path`, `server name`, and `log level` now read from config with defaults.
* Library: Added the `StaticFile` enumeration with a `contentType` property, plus typed config-key/value constants and the `Configuration` dependency on WebsiteCore.
* Assets: Added the **HTML5 boilerplate** (HTML, CSS, JS, icons, manifest, robots) to the *Resources/Static* folder.
* Docker: Stage the Resources directory as read-only.
* Tests: Added a test plan, and a shared Xcode scheme.

Reviewed-on: rock-n-code/loud-amsterdam#3
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Services/Website/Website.xctestplan

@@ -0,0 +1,37 @@
+{
+  "configurations" : [
+    {
+      "id" : "F3231E68-357B-4ED7-98E9-F5767AB17024",
+      "name" : "Test Scheme Action",
+      "options" : {
+
+      }
+    }
+  ],
+  "defaultOptions" : {
+    "performanceAntipatternCheckerEnabled" : true,
+    "targetForVariableExpansion" : {
+      "containerPath" : "container:",
+      "identifier" : "Website",
+      "name" : "Website"
+    },
+    "testInteropMode" : "complete"
+  },
+  "testTargets" : [
+    {
+      "target" : {
+        "containerPath" : "container:",
+        "identifier" : "WebsiteTests",
+        "name" : "WebsiteTests"
+      }
+    },
+    {
+      "target" : {
+        "containerPath" : "container:",
+        "identifier" : "WebsiteCoreTests",
+        "name" : "WebsiteCoreTests"
+      }
+    }
+  ],
+  "version" : 1
+}