Feature/add govuk react and use constants

[Loque-]

This PR resolves two issues;

• Corrects the font being used for components, by using @govuk-react/constants
• Updates individual component dependancies so they can be used in an isolated fashion

Whilst doing this, I noticed that the components should be using @govuk-react/constants a lot more, something for another ticket/PR.

[Loque-]

Rebased with master to merge earlier changes to package.json file

[codecov[bot]]

Codecov Report

Merging #35 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #35   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          19     19           
  Lines         146    146           
  Branches       16     16           
=====================================
  Hits          146    146

Impacted Files	Coverage Δ
components/keyline/src/index.js	100% <ø> (ø)	:arrow_up:
components/result-count/src/index.js	100% <ø> (ø)	:arrow_up:
components/distraction-free/src/index.js	100% <ø> (ø)	:arrow_up:
...ponents/compact-table-accordion-group/src/index.js	100% <ø> (ø)	:arrow_up:
components/table-accordion-group/src/index.js	100% <ø> (ø)	:arrow_up:
components/result-count-title/src/index.js	100% <ø> (ø)	:arrow_up:
components/remove-button/src/index.js	100% <ø> (ø)	:arrow_up:
components/title-result-count/src/index.js	100% <ø> (ø)	:arrow_up:
components/count/src/index.js	100% <ø> (ø)	:arrow_up:
components/arrow-left/src/index.js	100% <ø> (ø)	:arrow_up:
... and 3 more

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[Loque-]

Githubs rather harsh version of my actions are untrue! I applied the changes : D

Bar the test for the NTA constant... which I tried but it hits this as it must be doing something with the string;

[stevesims]

heh - emotion munging that string is unfortunate

i guess we could do something like this:

    expect(wrapper).toHaveStyleRule('font-family', NTA_LIGHT.replace(/\s/g, '');