gnu: go-github-com-alecthomas-chroma: Move to golang-xyz.

* gnu/packages/golang.scm (go-github-com-alecthomas-chroma): Move from
here ...
* gnu/packages/golang-xyz.scm: ... to here.

* gnu/packages/configuration-management.scm: Add (gnu packages
golang-xyz) module.

Change-Id: I0f5f7068f530b282f3636678e9edc4fad6c8c94a

gnu/packages/golang.scm

@@ -7643,35 +7643,6 @@ synchronizing plain text:
 @end itemize\n")
     (license license:expat)))
 
-(define-public go-github-com-alecthomas-chroma
-  (package
-    (name "go-github-com-alecthomas-chroma")
-    (version "0.8.0")
-    (source (origin
-              (method git-fetch)
-              (uri (git-reference
-                    (url "https://github.com/alecthomas/chroma")
-                    (commit (string-append "v" version))))
-              (file-name (git-file-name name version))
-              (sha256
-               (base32
-                "066a6rdmf670d3v5sc7chbn7db09ldgxjympb03pcqwk644dixb1"))))
-    (build-system go-build-system)
-    (arguments
-     `(#:import-path "github.com/alecthomas/chroma"))
-    (native-inputs
-     (list go-github-com-dlclark-regexp2
-           go-github-com-alecthomas-assert
-           go-github-com-alecthomas-colour
-           go-github-com-alecthomas-repr
-           go-github-com-mattn-go-isatty
-           go-github-com-sergi-go-diff))
-    (home-page "https://github.com/alecthomas/chroma/")
-    (synopsis "General purpose syntax highlighter in pure Go")
-    (description "Chroma takes source code and other structured text and
-converts it into syntax highlighted HTML, ANSI-coloured text, etc.")
-    (license license:expat)))
-
 (define-public go-github-com-muesli-reflow-wordwrap
   (package
     (name "go-github-com-muesli-reflow-wordwrap")