Revert "gnu: Add r-metadat."

This reverts commit 6804d2bc25.

This depends on r-mathjaxr.

gnu/packages/cran.scm

@@ -33440,27 +33440,6 @@ coefficients or scattering amplitudes, for seismological P and S-waves at an
 interface.")
     (license license:gpl2+)))
 
-(define-public r-metadat
-  (package
-    (name "r-metadat")
-    (version "1.2-0")
-    (source (origin
-              (method url-fetch)
-              (uri (cran-uri "metadat" version))
-              (sha256
-               (base32
-                "1f7mb3pw5d0akr09jjva06ay223izhpzbr21bapnw99x1kiybk7h"))))
-    (properties `((upstream-name . "metadat")))
-    (build-system r-build-system)
-    (propagated-inputs (list r-mathjaxr))
-    (home-page "https://github.com/wviechtb/metadat")
-    (synopsis "Meta-Analysis Datasets")
-    (description
-     "This package provides a collection of meta-analysis datasets for teaching
-purposes, illustrating/testing meta-analytic methods, and validating published
-analyses.")
-    (license license:gpl2+)))
-
 (define-public r-mathjaxr
   (package
     (name "r-mathjaxr")