Capitalize cluster names

doc.zih.tu-dresden.de/docs/jobs_and_resources/overview.md

@@ -16,17 +16,17 @@ components.
 
 ## Selection of Suitable Hardware
 
-The five clusters [`barnard`](barnard.md),
-[`alpha`](alpha_centauri.md),
-[`romeo`](romeo.md),
-[`power`](power9.md) and
-[`julia`](julia.md)
+The five clusters [`Barnard`](barnard.md),
+[`Alpha Centauri`](alpha_centauri.md),
+[`Romeo`](romeo.md),
+[`Power9`](power9.md) and
+[`Julia`](julia.md)
 differ, among others, in number of nodes, cores per node, and GPUs and memory. The particular
 [characteristica](hardware_overview.md) qualify them for different applications.
 
 ### Which Cluster Do I Need?
 
-The majority of the basic tasks can be executed on the conventional nodes like on `barnard`. When
+The majority of the basic tasks can be executed on the conventional nodes like on `Barnard`. When
 log in to ZIH systems, you are placed on a login node where you can execute short tests and compile
 moderate projects. The login nodes cannot be used for real experiments and computations. Long and
 extensive computational work and experiments have to be encapsulated into so called **jobs** and