text: Title: Outdated documentation
  Body: Most of the examples provided in your documentation do not seem to be functioning correctly. Even on your website’s first page, under the “Quick Start” section (https://haystack.deepset.ai/overview/quick-start), there appears to be an error regarding the “PredefinedPipeline.” The line “from haystack import Pipeline, PredefinedPipeline” results in an error indicating that “PredefinedPipeline” cannot be found. Where can I find the correct and up-to-date documentation?