Remove unused CommonMark wrappers for now.

Author: allevato

.gitmodules

@@ -1,19 +1,5 @@
 # Developing `swift-format`
 
-## Check Out the Submodules
-
-The `CCommonMark` target is a Git submodule that pulls the C code in
-[apple/swift-cmark](https://github.com/apple/swift-cmark) into this
-project.
-
-After you clone this repository, remember to run the following commands
-to make sure those sources are available to the compiler:
-
-```shell
-git submodule init
-git submodule update
-```
-
 ## Command Line Options for Debugging
 
 `swift-format` provides some hidden command line options to facilitate

Documentation/Development.md

@@ -24,17 +24,6 @@ let package = Package(
     .package(url: "https://github.com/apple/swift-syntax", .revision("xcode11-beta1")),
   ],
   targets: [
-    .target(
-      name: "CCommonMark",
-      exclude: [
-        "cmark/api_test",
-        // We must exclude main.c or SwiftPM will treat this target as an executable target instead
-        // of a library, and we won't be able to import it from the CommonMark Swift module.
-        "cmark/src/main.c",
-        "cmark/test",
-      ]
-    ),
-    .target(name: "CommonMark", dependencies: ["CCommonMark"]),
     .target(
       name: "SwiftFormat",
       dependencies: [
@@ -74,7 +63,6 @@ let package = Package(
         "SwiftSyntax",
       ]
     ),
-    .testTarget(name: "CommonMarkTests", dependencies: ["CommonMark"]),
     .testTarget(
       name: "SwiftFormatRulesTests",
       dependencies: [