make geopub/leaflet a separate library

leaflet.opam

@@ -0,0 +1,42 @@
+opam-version: "2.0"
+name: "leaflet"
+version: "0.2"
+synopsis: "Bindings for the Leaflet JavaScript library"
+description:
+  "leaflet is an OCaml bindings library for the Leaflet JavaScript library."
+maintainer: ["swrup <swrup@protonmail.com>"]
+authors: [
+  "pukkamustard <pukkamustard@posteo.net>"
+  "swrup <swrup@protonmail.com>"
+  "pena <pena@kumikode.org>"
+]
+license: "BSD-2-Clause"
+tags: ["leaflet" "javascript" "bindings" "interactive" "map" "openstreetmap"]
+homepage: "https://forge.kumikode.org/kumikode/leaflet"
+bug-reports: "https://forge.kumikode.org/kumikode/leaflet/issues"
+depends: [
+  "dune" {>= "2.9"}
+  "ocaml" {>= "4.08"}
+  "brr"
+  "js_of_ocaml"
+  "dune-site"
+  "tiny_httpd" {with-test}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "--promote-install-files=false"
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+  ["dune" "install" "-p" name "--create-install-files" name]
+]
+dev-repo: "git+https://forge.kumikode.org/kumikode/leaflet.git"