[Meta] Improving GitLab's Line Length

Resources

FE @iamphill This is a meta issue in order to adjust GitLab to better adhere to a better typographic line length in order to improve reading comfort.

The first step and most important place to tackle is:

• https://gitlab.com/gitlab-org/gitlab-ce/issues/20916 Project Issues & MR's %8.14

If that issue succeeds we can begin to look at:

• https://gitlab.com/gitlab-org/gitlab-ce/issues/23734 Wiki pages ~"UX ready"
• https://gitlab.com/gitlab-org/gitlab-ce/issues/20914 Project Home README.md ~"UX ready"
• https://gitlab.com/gitlab-org/gitlab-ce/issues/20919 Project Repository README.md ~"UX ready"
• https://gitlab.com/gitlab-org/gitlab-ce/issues/20920 Project Commit & Snippets comments ~"UX ready"
• https://gitlab.com/gitlab-org/gitlab-ce/issues/20918 Project & Profile Settings ~"UX ready"
• https://gitlab.com/gitlab-org/gitlab-ce/issues/30920 Even more condensed version of Project Issues & MR's discussions and descriptions
• Determine whether all pages should use limit-container-width or define when it should and should not be used. https://gitlab.com/gitlab-org/design.gitlab.com/issues/47