docs: try to prevent "remix" package footgun

[kisaragi-hiu]

Inspired by https://twitter.com/ryanflorence/status/1790041089778373076.

The remix package on npm is the first thing that comes up when one searches "remix" (as the exact match), appears updated regularly, and has no indication that it's no longer used. To hopefully mitigate this, this PR adds an explanation to point people to places they probably intended to go to.

This confusion is probably quite bad: of the 9 public dependents (npm says there are 11 but only lists 9, so I'm assuming the other 2 are private): one (remix-redis-session) has ~4000 weekly downloads (it depends on 1.3), the others all have 2 or 1 digit weekly downloads. That leaves about 18000 new downloads stepping into the footgun, which is comparatively about 4x (remix divided by @remix-run/server-runtime) or 0.5x (remix divided by @remix-run/router) as bad as the biome / @biomejs/biome situation judging by the ratios of weekly downloads.

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[remix-cla-bot]

Hi @kisaragi-hiu,

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳