[DOC] Update London OOM documentation

Add information:
- new Deployment options (Production, Development)
- move Istio deployment to base installation
- add Gateway-API and Keycloak Installation instructions
- split and rename of a few files for updated structure
- changed rst section formatting as suggested in sphinx rtd theme
- add London Release Notes

Issue-ID: OOM-3159

Signed-off-by: Andreas Geissler <andreas-geissler@telekom.de>
Change-Id: I98b8541d51daba982fd6c8be0c85fae676d53c13
diff --git a/docs/conf.py b/docs/conf.py
index 29c57e6..c77ad25 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -55,5 +55,7 @@
 
 linkcheck_ignore = [
   "https://istio-release.storage.googleapis.com/charts",
+  "https://charts.bitnami.com/bitnami",
+  "https://codecentric.github.io/helm-charts",
   r'http://localhost:\d+/'
 ]