add social icons to nav menu across both viewports

[freemvmt]

Description

An addendum to #86 to surface socials on mobile and desktop views in the top navigation, as per discussion on the ticket here.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I've checked the spec (e.g. Figma file) and documented any divergences.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I've updated the documentation accordingly.
• Replace unused checkboxes with bullet points.

[Copilot]

Pull request overview

Adds social media icon links back into the top navigation for both desktop and mobile viewports (as a follow-up to #86), while also correcting Bootstrap Icons class usage so icons render reliably.

Changes:

• Add social icon links to the desktop header area (md+).
• Add social icon links to the collapsed mobile navigation menu.
• Fix Bootstrap Icons class prefixes for the search icon and footer social icons (bi bi-*).

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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[joaquimds]

Approved. Copilot's comments are negligible imo

[freemvmt]

Approved. Copilot's comments are negligible imo

Thanks @joaquimds! I did take the advice and extract the socials as a template. I also buffed out the readme a bit with some of my notes from setup, in case useful for the next dev who lands here!