Enable consistent styling

[ciaranschutte]

Several components prohibit styling due to missing props.
There are conflicting usages of how we are styling which need to be made consistent.
Some rough edges to address also eg. need all colour codes defined.

Detailed Description

• ensure components have either a strictly defined set of props to customise or allow theme to be re-styled (don't just ...spread everything)
• documentation on how to approach styling
  • check for colours consts, use styled over inline css
  • some components we should define strict interface others (containers) we should allow to be customised.
  • output of this should be a wiki page
• make sure all colours are in the theme (involve Kim in the colour scheme process)

[ciaranschutte]

an upgrade to latest Emotion package could be worth while here too