Load doc-gen4 as a git dependency.

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "doc-gen4"]
-	path = doc-gen4
-	url = git@github.com:jrpotter/bookshelf-doc.git

doc-gen4

@@ -1 +0,0 @@
-Subproject commit d2db077fc447a918d90a4515d8fb77d41dd79e42

lake-manifest.json

@@ -82,11 +82,14 @@
    "inputRev": "doc-gen",
    "inherited": true,
    "configFile": "lakefile.lean"},
-  {"type": "path",
+  {"url": "https://github.com/jrpotter/bookshelf-doc",
+   "type": "git",
+   "subDir": null,
+   "rev": "c29c914910af31f82e73cc0ab77d918a6439fb80",
    "name": "«doc-gen4»",
    "manifestFile": "lake-manifest.json",
+   "inputRev": "main",
    "inherited": false,
-   "dir": "././doc-gen4",
    "configFile": "lakefile.lean"}],
  "name": "bookshelf",
  "lakeDir": ".lake"}

lakefile.lean

@@ -10,8 +10,9 @@ require mathlib from git
 require std from git
   "https://github.com/leanprover/std4.git" @
     "v4.3.0"
-meta if get_config? env = some "dev" then
-  require «doc-gen4» from "./doc-gen4"
+require «doc-gen4» from git
+  "https://github.com/jrpotter/bookshelf-doc" @
+    "main"
 
 @[default_target]
 lean_lib «Bookshelf» {