Resolve "Cloud Orchestration: relaunch page"

Service Orchestration subpage

• Rename site to service pipelines, because orchestration is not a popular wording.
• review text.
  • Move Minimal workflow pipeline as an example directly below advantages
  • Move challenges after the example and add subtitle
  • Delete dCache paragraph because article as a whole is too long and this part is very specific.
  • Reduce number of bulleted lists
    • text instead of list in minimal workflow pipeline subtitles
    • no bullet point before use cases
• Contact "Pipeline Team".

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Closes #502 (closed)