Add TSDoc and simplify components [fixes #103]

[zorfling]

While adding the TSDoc I noticed a couple of small issues, so I've fixed those here too.

So this PR:

• Adds TSDoc to types.ts
• Fixes use of custom key (it appeared unused in lieu of the name)
• Adds a story to test custom key
• Simplify InMenuOptionStuff and OutMenuOptionStuff to use a single component and styled-components to set the color - removes the need for activeClicked on outOptions

Fixes #103