Revise deployment documentation

The following points need to be revised in the documentation:

• Kubernetes section link doesnt work in documentation
• in post installation steps the password is wrong in keycloak
• in 1. Configure redirects it should be Clients not client
• On Tab Login > check User registration, -> This should mention that you need to go back to Realm Settings
• Configure email is optional for test runs right? Maybe we should mention that.
• Add an OpenSlice admin user -> formatting is a bit bad with the bulletpoints
• Navigate to manage/users -> Manage > Users
• Kubernetes installation in documentation should be updated to use the documentation I have written for helm
• https://10.10.10.10:9999 (This is the SOL005 NBI endpoint) make it clear to add port