Merge branch 'preview' into issue198

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

...tu-dresden.de/docs/software/data_analytics_with_python.md

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

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

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

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

doc.zih.tu-dresden.de/hackathon.md

doc.zih.tu-dresden.de/util/grep-forbidden-words.sh

twiki2md/root/Applications/Electrodynamics.md

twiki2md/root/Applications/SoftwareModulesList.md

twiki2md/root/PerformanceTools/IOTrack.md

twiki2md/root/SoftwareDevelopment/PerformanceTools.md

twiki2md/root/SystemTaurus/EnergyMeasurement.md

twiki2md/root/SystemTaurus/RunningNxGpuAppsInOneJob.md

twiki2md/root/WebHome/Accessibility.md

twiki2md/root/WebHome/FurtherDocumentation.md

twiki2md/root/WebHome/TypicalProjectSchedule.md