Update README and configuration for thunderstore.localhost integration

[Oksamies]

• Changed frontend and backend URLs in README to use thunderstore.localhost
• Updated entrypoint script to map thunderstore.localhost to backend nginx IP
• Modified docker-compose to sync new-thunderstore-localhost.conf
• Added new-thunderstore-localhost.conf for Nginx configuration

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Walkthrough

This pull request updates the development environment configuration from localhost-based hostnames to thunderstore.localhost-based hostnames. Changes include: updating the README Quick Start URLs, modifying the entrypoint.dev.sh host mapping logic to target thunderstore.localhost, updating docker-compose.remix.development.yml with new environment variables and expanded RSYNC exclusions, and renaming the nginx config file with corresponding hostname updates. No functional logic or behavioral changes were introduced.

Possibly related PRs

• Set up Docker development environment for Cyberstorm Remix #1663: Main PR that introduces the Docker/dev file structure being updated in this PR with the same hostname migration changes.
• Update Nimbus README with enw allowedHosts setup #1568: Related through shared host and allowed-hosts configuration updates for the cyberstorm-remix application.

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: updating configuration to use thunderstore.localhost instead of localhost.
Description check	✅ Passed	The description is directly related to the changeset, listing the key modifications across README, entrypoint script, docker-compose, and nginx configuration files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[Oksamies]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Enhance testing setup with Docker integration and Vitest configuration #1675 : 3 dependent PRs (#1660 , #1661 , #1676 )
• Update README and configuration for thunderstore.localhost integration #1677 👈 (View in Graphite)
• Consolidated changes and features that were developed during xmas time #1678 : 3 other dependent PRs (#1679 , #1680 , #1681 )
• master

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