Add blueimp-gallery as submodule

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "contrib/blueimp-gallery"]
+	path = contrib/blueimp-gallery
+	url = https://github.com/blueimp/Gallery.git

config.yaml

@@ -22,3 +22,28 @@ privacy:
     disable: true
   youtube:
     disable: true
+
+module:
+  mounts:
+  # Default mounts
+  - source: content
+    target: content
+  - source: static
+    target: static
+  - source: layouts
+    target: layouts
+  - source: data
+    target: data
+  - source: assets
+    target: assets
+  - source: i18n
+    target: i18n
+  - source: archetypes
+    target: archetypes
+  # Blueimp Gallery
+  - source: contrib/blueimp-gallery/css
+    target: static/blueimp/css
+  - source: contrib/blueimp-gallery/js
+    target: static/blueimp/js
+  - source: contrib/blueimp-gallery/img
+    target: static/blueimp/img

contrib/blueimp-gallery

@@ -0,0 +1 @@
+Subproject commit beddb391b0fd89959ac2a9607f3b6e59551ba0ef