Update snippet page layout
What does this MR do and why?
Update snippet page layout:
- Remove limited container class (align with changes made to Issuables)
- Use secondary text color for edited
- Adjust some spacings
Screenshots or screen recordings
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How to set up and validate locally
- Go to Snippets
- Create a snippet
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #430244 (closed)