remove opam-graph, which is released to opam-repository

packages/opam-graph.0.1.0~dev/opam

@@ -1,36 +0,0 @@
-opam-version: "2.0"
-maintainer: "Robur <team@robur.coop>"
-authors: ["Robur <team@robur.coop>"]
-homepage: "https://git.robur.io/robur/opam-graph"
-dev-repo: "git+https://git.robur.io/robur/opam-graph.git"
-bug-reports: "https://github.com/roburio/opam-graph/issues"
-license: "ISC"
-
-depends: [
-  "ocaml" {>= "4.08.0"}
-  "dune" {>= "2.0.0"}
-  "cmdliner" {>= "1.1.0"}
-  "fmt" {>= "0.8.7"}
-  "logs"
-  "opam-core"
-  "opam-format"
-  "ocamldot"
-  "rresult"
-  "tyxml"
-  "gg"
-]
-build: [
-  ["dune" "subst"] {dev}
-  ["dune" "build" "-p" name "-j" jobs]
-  ["sh" "-ex" "packaging/FreeBSD/create_package.sh"] {os = "freebsd"}
-  ["sh" "-ex" "packaging/debian/create_package.sh"] {os-family = "debian"}
-]
-
-synopsis: "Graphing dependencies of opam packages"
-description: """
-This package outputs graphs (in svg and dot) of opam packages.
-"""
-
-url {
-  src: "git+https://git.robur.io/robur/opam-graph.git"
-}