Update UK Biobank variant page URL to pheweb.org/UKB-TOPMed#607

Copilot wants to merge 2 commits intomasterFINNGEN/pheweb:masterfrom

copilot/update-uk-biobank-variant-urlFINNGEN/pheweb:copilot/update-uk-biobank-variant-urlCopy head branch name to clipboard