Component: Add Buttons documentation
Add necessary documentation, including usage and specs, that relate to the buttons component
This includes:
- Default
- Info
- Success
- Warning
- Danger
- Disabled
- Dropdown and split dropdown
- Icon
Links to information about usage:
- https://gitlab.com/gitlab-org/gitlab-ce/issues/29641
- https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16758#note_56829770
- https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16758#note_57221132
- Buttons vs links: https://gitlab.com/gitlab-org/gitlab-ce/issues/21287#note_17099288
Transfer/update existing information regarding buttons: https://docs.gitlab.com/ee/development/ux_guide/components.html#buttons
Edited by Pedro Moreira da Silva