Use https://www.npmjs.com/package/styled-reset to apply css resets and
move all global styles to the GlobalStyle component.
Update general styles inline with design design work.
Rather than using relative paths for css imports - which can break when
we move files around - add our styles path to the webpack sass-loader
loader using the `includePaths` setting.
fix(multi-lang): switch ticker to settings store
fix(tests): pass all tests
fix(fiat): switch from usd to fiat
fix(settings): fix console errors
fix(settings): make styles consistent
fix(tests): remove unneeded mocks
fix(payform): call satoshisToFiat now
fix(network): rebase + fix network fiat amt
White on yellow presents accessibility challenges and should be avoided.
Change the white on yellow used in highlighted buttons for a darker
colour against the yellow background.
Fix#356