Miscellaneous: devise views, membership activation tokens, default proposal text, limit team members to one per show/event combination

[mickzijdel]

Features

• Limit team members to only one per user/event combination to prevent duplicates.

• Changes

• Always show the tiny hint on the MD input field.
• Add bottom margins to the fields_for template
• Add tests for if emails are sent on account creation, archives static pages, admin static controller, and staffing phone checks.

Fixes

• Remove unnecessary whitespace around the book now widget.
• Fix condition on showing add user on roles pages
• Fix status field on proposals to be a select
• Add some things I forgot for staffing and maintenance.