fix: Add repository directory to all package descriptors

[kriskowal]

fixes: #1754

This adds a repository directory to every package’s descriptor package.json so that npmjs.com can render relative links correctly.

[kriskowal]

This was mostly the work of:

ls packages | while read -r name; do (cd packages/$name; jq '. + {repository: (.repository + {$directory})}' --arg directory "packages/$name" package.json > package.json2); done

[gibson042]

Nice!