Refactor snippets API documentation page
What does this MR do?
Standardises the layout and content of the snippets API page, and establishes connections between the API page and the conceptual material.
Related issues
Relates to: https://gitlab.com/gitlab-org/gitlab-ce/issues/10421
Author's checklist
Review checklist
-
Your team's review (required) -
Technical writer's review (required)
Edited by Evan Read