chore(docs): update links to new STACKIT docs

Author: GokceGK

README.md

@@ -99,7 +99,7 @@ More examples on other services, configuration and authentication possibilities
 
 ## Authentication
 
-To authenticate with the SDK, you need a [service account](https://docs.stackit.cloud/stackit/en/service-accounts-134415819.html) with appropriate permissions (e.g., `project.owner`, see [here](https://docs.stackit.cloud/stackit/en/assign-permissions-to-a-service-account-134415855.html)). You can create a service account through the STACKIT Portal.
+To authenticate with the SDK, you need a [service account](https://docs.stackit.cloud/platform/access-and-identity/service-accounts/) with appropriate permissions (e.g., `project.owner`, see [here](https://docs.stackit.cloud/platform/access-and-identity/roles-permissions/assign-roles-to-account/)). You can create a service account through the STACKIT Portal.
 
 ### Authentication Methods
 
@@ -130,8 +130,8 @@ For each authentication method, the key flow is attempted first, followed by the
 1. Create a service account key in the STACKIT Portal:
 
    - Navigate to `Service Accounts` → Select account → `Service Account Keys` → Create key
-   - You can either let STACKIT generate the key pair or provide your own RSA key pair (see [Creating an RSA key-pair](https://docs.stackit.cloud/stackit/en/usage-of-the-service-account-keys-in-stackit-175112464.html#UsageoftheserviceaccountkeysinSTACKIT-CreatinganRSAkey-pair) for more details)
-   - **Note**: it's also possible to create the service account key in other ways (see [Tutorials for Service Accounts](https://docs.stackit.cloud/stackit/en/tutorials-for-service-accounts-134415861.html) for more details)
+   - You can either let STACKIT generate the key pair or provide your own RSA key pair (see [Creating an RSA key-pair](https://docs.stackit.cloud/platform/access-and-identity/service-accounts/how-tos/manage-service-account-keys/) for more details)
+   - **Note**: it's also possible to create the service account key in other ways (see [Tutorials for Service Accounts](https://docs.stackit.cloud/platform/access-and-identity/service-accounts/how-tos/manage-service-accounts/) for more details)
 
 2. Save the service account key JSON:
 
@@ -194,7 +194,7 @@ For each authentication method, the key flow is attempted first, followed by the
 1. Create an access token in the STACKIT Portal:
 
    - Navigate to `Service Accounts` → Select account → `Access Tokens` → Create token
-   - **Note**: it's also possible to create the service account access tokens in other ways (see [Tutorials for Service Accounts](https://docs.stackit.cloud/stackit/en/tutorials-for-service-accounts-134415861.html) for more details)
+   - **Note**: it's also possible to create the service account access tokens in other ways (see [Tutorials for Service Accounts](https://docs.stackit.cloud/platform/access-and-identity/service-accounts/how-tos/get-access-token/) for more details)
 
 2. Configure authentication using any of these methods: