Redesign the sign-in page

Problem to solve

As commented in the issue,

• Not aligning with the latest design system (Font, button width)
• Footer is not visible (position problem maybe?)
• Inconsistency in the .com page and the self-hosted page
• Repetitive information provided

Intended users

All GitLab users

Current design

.com	Self-hosted

The first iteration

• WIP prototype

Further details

• Self-hosted
• .com

Links / references

• Configurable area: https://docs.gitlab.com/ee/user/admin_area/appearance.html#favicon