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/insert_it_de.md

@@ -0,0 +1,80 @@
+# Insert IT Apps
+
+Support Apps provided by [Insert IT](https://insert-it.de/). The official homepage is using the URL [Insert Infotech](https://insert-infotech.de/) instead.
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: insert_it_de
+      args:
+        municipality: Municipality
+        street: Street Name
+        hnr: House Number
+        location_id: Location ID
+```
+
+### Configuration Variables
+
+**municipality**  
+*(string) (required)*
+
+**street**  
+*(string) (optional)*
+
+**hnr**  
+*(integer) (optional)*
+
+**location_id**  
+*(integer) (optional)*
+
+
+Either `street` and `hnr` or `location_id` is required. Both could also be set, but `location_id` is prioritized.
+If none is set, it will fail.
+
+
+Currently supported municipalities:
+
+|Region|
+|-|
+| Hattingen |
+| Herne |
+| Kassel |
+| Krefeld |
+| Luebeck |
+| Mannheim |
+| Offenbach |
+
+
+## Example
+
+Using Location ID
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: insert_it_de
+      args:
+        municipality: Mannheim
+        location_id: 430650
+```
+
+Using Street and House Number
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: insert_it_de
+      args:
+        municipality: Offenbach
+        street: Kaiserstraße
+        hnr: 1
+```
+
+
+## How to get the source arguments
+
+Easy way to get the `location_id` source argument is to use a (desktop) browser, eg.g Google Chrome:
+
+1. Open the digital abfallkalender, e.g. for Offenbach [https://www.offenbach.de/stadtwerke/stadtservice/Entsorgung/abfallkalender.php](https://www.offenbach.de/stadtwerke/stadtservice/Entsorgung/abfallkalender.php).
+2. Enter the street name and the number
+3. Right click on the iCalendar link and select "Copy Link Address"
+4. Paste somewhere like a notepad to get the full URL. Eg: https://www.insert-it.de/BmsAbfallkalenderOffenbach/Main/Calender?bmsLocationId=7036&year=2024
+5. The bmsLocationId argument is the location id that you need to use in the configuration as `location_id`.