Fix navigation entry and links

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

@@ -10,7 +10,7 @@ The following tools are available on ZIH systems, among others:
 * [Python](data_analytics_with_python.md)
 * [R](data_analytics_with_r.md)
 * [RStudio](data_analytics_with_rstudio.md)
-* [Big Data framework Spark](big_data_frameworks_spark.md)
+* [Big Data framework Spark](big_data_frameworks.md)
 * [MATLAB and Mathematica](mathematics.md)
 
 Detailed information about frameworks for machine learning, such as [TensorFlow](tensorflow.md)

doc.zih.tu-dresden.de/mkdocs.yml

@@ -45,7 +45,7 @@ nav:
       - Data Analytics with R: software/data_analytics_with_r.md
       - Data Analytics with RStudio: software/data_analytics_with_rstudio.md
       - Data Analytics with Python: software/data_analytics_with_python.md
-      - Apache Spark: software/big_data_frameworks_spark.md
+      - Big Data Analytics: software/big_data_frameworks.md
     - Machine Learning:
       - Overview: software/machine_learning.md
       - TensorFlow: software/tensorflow.md