Resolve #456

• Add example for script that submits chain jobs
• Refine examples (lower case for variable names)
• Add description of examples
• Add output when executing the examples scripts

requested review from @jitschin--tu-dresden.de

assigned to @mflehmig--tu-dresden.de

added 25 commits

• 24c7ab6a...5b36a572 - 24 commits from branch preview
• ec10f411 - Merge branch 'preview' into issue456

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added Content Refinement label

added 1 commit

• 56ea1524 - adjusted bash example code, to be consistent with Google's Coding Guidelines (Work in Progress)

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added 1 commit

• 566bdb23 - updated bash code style in slurm_examples.md

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merged

mentioned in commit 9caf0f25