0.5.0

• Show pīkau titles on pathway diagram when required. (fixes #49)
• Add 'What is computational thinking?' and 'Computational thinking - The international perspective' pīkau. (fixes #50)
• Update pikau content pages to be closer to iQualify style.
• Fix release script calling invalid command. (fixes #48)
• Update licence. (fixes #52)
• Pīkau documentation updates:
  • Update documentation regarding usage of images and videos. (fixes #53)
  • State box formatting cannot be used within overview. (fixes #43)