Added Insert-IT as a service provider (#1717)

* Added Insert IT

Added Insert IT as a source for all Insert IT based Apps. Therefore deleted Offenbach. Mannheim moved also to Insert IT from Abfall+.

Also added:
- Hattingen
- Herne
- Kassel
- Krefeld

* Updated Readme and info Files

* Tests completed

* fix whitespace

* Added Luebeck and fixed docs

* Readme and info updated with Luebeck

* Added offenbach_de source back for compatibility

* fix deprecated source offenbach_de

---------

Co-authored-by: 5ila5 <5ila5@users.noreply.github.com>

doc/source/lund_se.md

@@ -0,0 +1,34 @@
+# Lund
+
+Support for schedules provided by [lund.se](https://lund.se/).
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: lund_se
+      args:
+        street_address: STREET ADDRESS
+```
+
+### Configuration Variables
+
+**street_address**  
+*(string) (required)*
+
+
+### How to get the street address
+
+1. Go to <https://lund.se/bygga-och-bo/avfall-och-atervinning/nar-toms-mitt-karl> and search your address below Tömningsschema.
+2. Use exactly the address that is displayed in the search result.
+
+## Example
+
+```yaml
+waste_collection_schedule:
+  sources:
+   - name: lund_se
+      args:
+        street_address: Annedalsvägen 2 B, LUND (39037)
+```