fix link to contributors

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move appconfig plugin down, as it is less important

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s/plugin-tutorial/tutorial

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simplify intro

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typos

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move plugins/plugins-tutorial to /plugins/tutorial in de/

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enable analytics

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set title

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fix category underlining

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Change headline
Small wording changes
wip
Fixed wording, typos, formatting.
link to new Backbone plugin
quickfix for font issue