Add the book theme as a submodule.

jacobsimpson · jacobsimpson · commit 08ac5e95b5cf · 2019-11-21T01:35:02.000-08:00
diff --git a/.gitmodules b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "themes/book"]
+	path = themes/book
+	url = https://github.com/alex-shpak/hugo-book
diff --git a/themes/book b/themes/book
@@ -0,0 +1 @@
+Subproject commit 20c3faae4d6ff0bf842d0a947e9932ea98b56d48

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+[submodule "themes/book"]`
	`2`	`+ path = themes/book`
	`3`	`+ url = https://github.com/alex-shpak/hugo-book`