Now point to doc-gen4 fork.

.gitmodules

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

doc-gen4

@@ -0,0 +1 @@
+Subproject commit 86d5c219a9ad7aa686c9e0e704af030e203c63a1

lake-manifest.json

@@ -82,14 +82,11 @@
    "inputRev": "doc-gen",
    "inherited": true,
    "configFile": "lakefile.lean"},
-  {"url": "https://github.com/leanprover/doc-gen4",
-   "type": "git",
-   "subDir": null,
-   "rev": "86d5c219a9ad7aa686c9e0e704af030e203c63a1",
+  {"type": "path",
    "name": "«doc-gen4»",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "main",
    "inherited": false,
+   "dir": "././doc-gen4",
    "configFile": "lakefile.lean"}],
  "name": "bookshelf",
  "lakeDir": ".lake"}

lakefile.lean

@@ -11,8 +11,7 @@ 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 git "https://github.com/leanprover/doc-gen4" @
-    "main"
+  require «doc-gen4» from "./doc-gen4"
 
 @[default_target]
 lean_lib «Bookshelf» {