Use pkg registry for core packages

[grst]

Close #190

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[grst]

Looks mostly good, however we need to address

• the order of packages (before it was a custom arbitrary order, approx ranked by importance/github stars) - now it's completely random
• some additional links are missing, e.g Muon.jl, spatialdata-io

[flying-sheep]

I think there are two possibilities:

1. re-curate order (maybe put github stars into the JSON or so) or
2. lean into random order and shuffle them with JS

Idk where I read this, but someone said recently that GitHub stars mostly measure how “flashy” a project is, so maybe not an ideal metric.