Allow user selection of the phone number displayed

[awslattery]

Currently, on both mobile and fullsize devices, a user cannot select the phone number displayed, due to a user-select property set higher up in the styled-component tree.

For users who wish to copy the number, but not auto-populate their vote (e.g. their version of iOS doesn't support the modern SMS intent), they should be able to:

• [ ] select the voting phone number, and interact with their native clipboard

This could be accomplished simply by adding user-select: text; to the VotingPhoneNumber styled component in client\src\components\Voting\Instructions\index.js.

[drwm-base]

Hi, I would like to attempt this issue!