Project milestone list page redesign

Designs from https://gitlab.com/gitlab-org/gitlab-ce/issues/35833

Project milestone list page

• e.g. https://gitlab.com/gitlab-org/gitlab-ce/milestones

• All the milestones here are project milestones, so display that accordingly.

• If no dates entered, display nothing.

• If start date entered only, display Start date: Aug 17, 2017

• If end date entered only, display End date: Aug 18, 2017

• If both start date and end date entered, display Aug 17, 2017 - Aug 18, 2017

• If the end date is entered and today is after the end date and the milestone is open, it is a past due milestone.

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