fix: remove docc

Author: tornikegomareli

Package.swift

@@ -13,9 +13,6 @@ let package = Package(
       name: "gitdiff",
       targets: ["gitdiff"]),
   ],
-  dependencies: [
-    .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"),
-  ],
   targets: [
     .target(
       name: "gitdiff"