fix: Update Onboarding component and make Terms & Conditions consistent on taskbar app

* Note: To quickly see the changes force the Onboarding component (displaying Terms & Conditions screen) to appear by changing
`if (isFirstRun) {` to `if (true) {` in `fether-react/src/App/App.js. The screen should be consistent when you run `yarn taskbar` and `yarn start`

* Terms & Conditions updates for consistency and compatibility with taskbar app

	* Add extra side padding `-padded-extra` to Terms & Conditions so consistent with rest of site and in taskbar app

	* Wrap with `.terms-and-conditions-wrapper` to add box shadow around both the
	'Please read carefully' label and associated Terms & Conditions

	* Adjust height of `.terms-and-conditions` down to 16rem otherwise with more side padding it causes
	overflow to occur with vertical scrollbar appearing (checked that it works on both taskbar app
	i.e. `yarn taskbar` and normal app `yarn electron` or `yarn start`)

	* Hide `overflow-x` in Terms and Conditions as caused horizontal scroll on taskbar app

	* Add top margin to Terms and Conditions so extra gap from its 'Please read carefully' label

	* Only left padding in Terms and Conditions