Implemented (a first version of) the DocCMiddleware middleware in the library target.

Library/Sources/Internal/Enumerations/AssetPrefix.swift

@@ -0,0 +1,22 @@
+enum AssetPrefix: String, CaseIterable {
+    case css
+    case data
+    case downloads
+    case images
+    case img
+    case index
+    case js
+    case videos
+}
+
+// MARK: - Pathable
+
+extension AssetPrefix: Pathable {
+    
+    // MARK: Computed
+    
+    var path: String {
+        .init(format: .Format.pathRoot, rawValue)
+    }
+    
+}

Library/Sources/Internal/Enumerations/IndexPrefix.swift

@@ -0,0 +1,16 @@
+enum IndexPrefix: String, CaseIterable {
+    case documentation
+    case tutorials
+}
+
+// MARK: - Pathable
+
+extension IndexPrefix: Pathable {
+    
+    // MARK: Computed
+    
+    var path: String {
+        .init(format: .Format.pathRoot, rawValue)
+    }
+    
+}

Library/Sources/Internal/Enumerations/StaticFile.swift

@@ -0,0 +1,21 @@
+enum StaticFile: String, CaseIterable {
+    case documentation = "documentation.json"
+    case faviconICO = "favicon.ico"
+    case faviconSVG = "favicon.svg"
+    case themeSettings = "theme-settings.json"
+}
+
+// MARK: - Pathable
+
+extension StaticFile: Pathable {
+    
+    // MARK: Computed
+    
+    var path: String {
+        switch self {
+        case .documentation: "/data/" + rawValue
+        default: .init(format: .Format.pathRoot, rawValue)
+        }
+    }
+    
+}