Remix is stale, add Route Router template to Fullstack

[tats-u]

Description of Bug

Provide a concise description of your bug and your project link (if applicable).

Steps to Reproduce

1. Go to https://stackblitz.com/
2. Click on New Project
3. Select Fullstack
4. No "React Router" template, only "Remix" one

Expected Behavior

There is a "React Router" (or "React Router (Remix)" template

Screenshots/Screencast

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Additional Context/Questions
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React Router v7 is the successor of Remix v2: https://remix.run/blog/react-router-v7