Improve interactivity (desktop)

[carloferrer]

• Make links glow/grow on hover.
• Make links open in new tab.
• Persist sticky header at top when user scrolls past.

Static tweaks:

• Add separator (e.g., dots) between employment/project items (both desktop and mobile).
• Increase effective click area of links (particularly for Projects section).
• Add SVG icons to Details (and maybe also Projects) section.
• Add monochrome headshot.

[carloferrer]

• Headshot not added to prevent bias.
• Sticky header to be addressed in separate issue.