Resolve "Further improvements to Project overview UI"

What does this MR do?

Continues the iteration on the project overview UI:

• moved star, fork and new clone button (copy SSH/HTTPS URLs) to top right, made them smaller
• avatar is now larger (64px)
• 'Request access' is now a link instead of a button
• overview comes before the description + changed styling and added icons
• description font-size is now 16px (large-paragraph)
• quick links to files are moved downwards below the commit/pipeline info
• margins changed to group content into 4 groups to clean up the interface
• visibility info reduced to icon-only and moved to the right of the title

Screenshots

Before

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After

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What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/51243

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides

Closes #51243 (closed)