Point to github, not gogs, for image-editor submodule; ignore copy in static

.gitignore

@@ -9,6 +9,9 @@
 dynamic/data/*
 !dynamic/data/__init__.py
 
+# Image editor copy in static
+static/image-editor/
+
 # Python virtual environment
 env/
 

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "image-editor"]
 	path = image-editor
-	url = ssh://git@gogs.davte.it:8445/michelezoncheddu/image-editor.git
+	url = git@github.com:michelezoncheddu/image-editor.git

image-editor

@@ -1 +1 @@
-Subproject commit 8e927fffbd4c967e90d9f88498d41c2303660b18
+Subproject commit c3ac9015cd721ee6738d4e84ebba7b76e5181939