Add CV PDF link to social icons

[lukasschirren]

Fixes issue #3243

Add CV PDF link to social icons

• Added CV icon to social media links section
• CV appears after LinkedIn icon in the contact section
• Uses academicons CV symbol for consistent academic styling
• Links to /assets/pdf/CV_Schirren.pdf and opens in new tab
• Updated _includes/social.liquid to handle cv_pdf field
• Updated _data/socials.yml with CV configuration
• Updated _scripts/search.liquid.js with cv search functionality

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[george-gca]

This needs to be added to more places. Check our newly added section in CONTRIBUTING.md.

[lukasschirren]

I updated the PR to refer to the issue. Also updated the _scripts/search.liquid.js file to enable search functionality. Anything else?