Add header slider with admin manageable slides

Sébastiaan Versteeg requested to merge feature/header-slider into master

Closes #694 (closed)

Short description

Add header slider with admin manageable slides

Steps to use this feature

  1. Add a slide
  2. One image shown
  3. Add another slide
  4. Navigatable slider shown
Edited by Sébastiaan Versteeg

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