rosenthal: Remove tree-sitter-dockerfile. [upstreamed]

* rosenthal/packages/tree-sitter.scm (tree-sitter-dockerfile): Delete variable.
* README.org (Packages): Remove it.

README.org

@@ -114,7 +114,6 @@ Rosenthal 頻道定義如下，將其加入 =~/.config/guix/channels.scm= 以由
 + qogir-icon-theme
 + socks2http
 + tree-sitter-cmake
-+ tree-sitter-dockerfile
 + tree-sitter-yaml
 
 Binary Packages / 二進制包：

rosenthal/packages/tree-sitter.scm

@@ -12,14 +12,6 @@
    "0.4.0"
    #:repository-url "https://github.com/uyha/tree-sitter-cmake"))
 
-;; <https://issues.guix.gnu.org/64431>
-(define-public tree-sitter-dockerfile
-  (tree-sitter-grammar
-   "dockerfile" "Dockerfile"
-   "0kf4c4xs5naj8lpcmr3pbdvwj526wl9p6zphxxpimbll7qv6qfnd"
-   "0.1.2"
-   #:repository-url "https://github.com/camdencheek/tree-sitter-dockerfile"))
-
 (define-public tree-sitter-yaml
   (let ((base
          (tree-sitter-grammar