Fix home-manager impurity and add brew configuration

modules/overlays/changedetection.io/setup.patch

@@ -0,0 +1,20 @@
+new file mode 100644
+index 0000000..e4db3d0
+--- /dev/null
++++ b/MANIFEST.in
+@@ -0,0 +1 @@
++recursive-include backend *
+diff --git a/setup.py b/setup.py
+new file mode 100644
+index 0000000..82bc34d
+--- /dev/null
++++ b/setup.py
+@@ -0,0 +1,8 @@
++from setuptools import setup, find_packages
++
++setup(
++    name="changedetection.io",
++    include_package_data=True,
++    packages=find_packages(),
++    scripts = [ './changedetection.py' ],
++)