Initalized CPN docs

Reviewed-by: tischrei <tino.schreiber@t-systems.com>
Co-authored-by: Gode, Sebastian <sebastian.gode@t-systems.com>
Co-committed-by: Gode, Sebastian <sebastian.gode@t-systems.com>

doc/source/cpn/backend/index.rst

@@ -0,0 +1,14 @@
+=======
+Backend
+=======
+
+Updating the Backend
+--------------------
+
+You can update the Backend by following those steps:
+
+1. Merge the Pull-Request
+2. Wait until the gate job has been passed
+3. Look at the Zuul-logs from the gate job. Find the line with `Successfully tagged quay.io` and remember the `:change_xx_latest` value
+4. Open a Pull-Request to adjust the kustomization config to the new tag from step 3. https://github.com/opentelekomcloud-infra/system-config/blob/main/kubernetes/circle-partner-navigator/base/kustomization.yaml#L14
+5. Merge this Pull-Request and wait 10 minutes.

doc/source/cpn/frontend/index.rst

@@ -0,0 +1,16 @@
+========
+Frontend
+========
+
+Updating the Frontend
+---------------------
+
+You can update the Frontend by following those steps:
+
+1. Merge the Pull-Request
+2. Tag the desired commit and push the tag to Github. It should be visible afterwards on this page: https://github.com/opentelekomcloud-infra/circle-partner-navigator-frontend/tags
+3. Wait at least 10 minutes
+4. Open a Pull-Request to adjust the kustomization config to the new tag. https://github.com/opentelekomcloud-infra/system-config/blob/main/kubernetes/circle-partner-navigator/base/kustomization.yaml#L16
+5. Merge this Pull-Request and wait 10 minutes.
+
+Be aware that updating the Frontend will also pull the data from the Backend again and as a result will also update the partner data on the website.

doc/source/cpn/index.rst

@@ -0,0 +1,9 @@
+========================
+Circle Partner Navigator
+========================
+
+.. toctree::
+    :maxdepth: 1  
+
+    backend/index
+    frontend/index

doc/source/index.rst

@@ -6,3 +6,4 @@ Internal Documentation
    :maxdepth: 2    
 
    training/index
+   cpn/index