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/Sources/Library/Public/Extensions/AbsoluteConfigKey+Constants.swift

@@ -0,0 +1,23 @@
+import Configuration
+
+extension AbsoluteConfigKey {
+    /// A namespace for the HTTP server configuration keys, as absolute keys.
+    public enum HTTP {
+        /// The absolute configuration key for the host the server binds to.
+        public static let host: AbsoluteConfigKey = .init(.HTTP.host)
+        /// The absolute configuration key for the port the server listens on.
+        public static let port: AbsoluteConfigKey = .init(.HTTP.port)
+        /// The absolute configuration key for the server's name.
+        public static let serverName: AbsoluteConfigKey = .init(.HTTP.serverName)
+    }
+    /// A namespace for the logging configuration keys, as absolute keys.
+    public enum Log {
+        /// The absolute configuration key for the minimum log level.
+        public static let level: AbsoluteConfigKey = .init(.Log.level)
+    }
+    /// A namespace for the path configuration keys, as absolute keys.
+    public enum Path {
+        /// The absolute configuration key for the directory the static files are served from.
+        public static let staticFiles: AbsoluteConfigKey = .init(.Path.staticFiles)
+    }
+}

Services/Website/Sources/Library/Public/Extensions/ConfigKey+Constants.swift

@@ -0,0 +1,23 @@
+import Configuration
+
+extension ConfigKey {
+    /// A namespace for the HTTP server configuration keys.
+    public enum HTTP {
+        /// The configuration key for the host the server binds to.
+        public static let host: ConfigKey = "http.host"
+        /// The configuration key for the port the server listens on.
+        public static let port: ConfigKey = "http.port"
+        /// The configuration key for the server's name.
+        public static let serverName: ConfigKey = "http.serverName"
+    }
+    /// A namespace for the logging configuration keys.
+    public enum Log {
+        /// The configuration key for the minimum log level.
+        public static let level: ConfigKey = "log.level"
+    }
+    /// A namespace for the path configuration keys.
+    public enum Path {
+        /// The configuration key for the directory the static files are served from.
+        public static let staticFiles: ConfigKey = "path.staticFiles"
+    }
+}

Services/Website/Sources/Library/Public/Extensions/ConfigValue+Constants.swift

@@ -0,0 +1,18 @@
+import Configuration
+
+extension ConfigValue {
+    /// A namespace for the HTTP server's default configuration values.
+    public enum HTTP {
+        /// The default host the server binds to.
+        public static let host: ConfigValue = .init(stringLiteral: "127.0.0.1")
+        /// The default port the server listens on.
+        public static let port: ConfigValue = .init(stringLiteral: "0")
+        /// The default server name.
+        public static let serverName: ConfigValue = .init(stringLiteral: .Server.name)
+    }
+    /// A namespace for the logging default configuration values.
+    enum Log {
+        /// The default minimum log level.
+        public static let level: ConfigValue = .init(stringLiteral: "trace")
+    }
+}

Services/Website/Sources/Library/Public/Extensions/String+Constants.swift

@@ -0,0 +1,12 @@
+extension String {
+    /// A namespace for well-known path string constants.
+    public enum Path {
+        /// The directory, relative to the working directory, that the website's static files are served from.
+        public static let staticResources = "Resources/Static"
+    }
+    /// A namespace for the server string constants.
+    public enum Server {
+        /// The website server's name.
+        public static let name = "LoudWebsite"
+    }
+}