Move German help file into Wiki

[avogelba]

Originally reported by: Oliver (Bitbucket: assarbad, GitHub: assarbad)

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This should then be finalized by removing the respective folder from the source repository and adjusting the source code to refer to the help on the website instead of a local one.

Related to:

• issue #72 (research the Wiki semantics)
• issue #83 (English help, 0409)
• issue #84 (German help, 0407)
• issue #85 (Hungarian help, 040e)
• issue #86 (Polish help, 0415)

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• Bitbucket: https://bitbucket.org/windirstat/windirstat/issue/84