Fix links to scads.ai

doc.zih.tu-dresden.de/docs/index.md

@@ -48,4 +48,4 @@ for a detailed overview of the courses and the respective dates at ZIH.
 Furthermore, Center for Scalable Data Analytics and Artificial Intelligence
 [ScaDS.AI](https://scads.ai) Dresden/Leipzig offers various trainings with HPC focus.
 Current schedule and registration is available at the
-[ScaDS.AI trainings page](https://scads.ai/transfer-2/teaching-and-training/).
+[ScaDS.AI trainings page](https://scads.ai/transfer/teaching-and-training/).

doc.zih.tu-dresden.de/docs/software/big_data_frameworks.md

@@ -286,4 +286,4 @@ A: Please check the work capability on a simple example as shown in this documen
 !!! help
 
     If you have questions or need advice, please use the contact form on
-    [https://scads.ai/contact/](https://scads.ai/contact/) or contact the HPC support.
+    [https://scads.ai/about-us/](https://scads.ai/about-us/) or contact the HPC support.