remove NeXus library

SetupComputer20.04.md

@@ -36,21 +36,6 @@ sudo cp ~/work/stxm/SystemInstall/epics-64.conf /etc/ld.so.conf.d
 sudo ldconfig
 ```
 
-- Compile Nexus Library
-
-```
-mkdir ~/BaseSystem
-cd ~/BaseSystem/
-# get latest Version of Nexus
-wget https://github.com/nexusformat/code/archive/master.zip
-unzip master.zip
-mv code-master nexus
-cd nexus
-cmake -DENABLE_CXX=1 .
-make
-sudo make install
-```
-
 - Install Intens
 
 ```