Fix layout.config.tsx URLs

[Xanderxx46]

Fixes showcase and github in the dropdown menu, sponsors and blog are still missing cus idk what should go there.

[changeset-bot]

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Latest commit: ea185db

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[pkg-pr-new]

Open in Stackblitz

@buape/carbon

pnpm add https://pkg.pr.new/buape/carbon/@buape/carbon@105

create-carbon

pnpm add https://pkg.pr.new/buape/carbon/create-carbon@105

@buape/carbon-linked-roles

pnpm add https://pkg.pr.new/buape/carbon/@buape/carbon-linked-roles@105

@buape/carbon-request

pnpm add https://pkg.pr.new/buape/carbon/@buape/carbon-request@105

@buape/carbon-nodejs

pnpm add https://pkg.pr.new/buape/carbon/@buape/carbon-nodejs@105

commit: ea185db

[thewilloftheshadow]

Blog can be removed, sponsors can link to our GitHub sponsors page