docs: Add Docker to Scaffold Stellar prerequisites

[Copilot]

stellar scaffold watch requires a running Docker daemon to spin up a local Stellar node via the stellar/quickstart image, but Docker was absent from the prerequisites table — causing new users to hit an opaque connection error mid-setup.

Changes

• docs/tools/scaffold-stellar.mdx — Added Docker row to the prerequisites table (EN)
• i18n/es/.../tools/scaffold-stellar.mdx — Same addition in Spanish
• i18n/es/.../tools/developer-tools/scaffold-stellar.mdx — Same addition in the alternate Spanish location

New row added across all three files:

Tool	Description	Install Link
Docker	For running a local Stellar network via the stellar/quickstart image	Download Docker Desktop

Original prompt

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This section details on the original issue you should resolve

<issue_title>Docs: Add Docker to Prerequisites for Scaffold Stellar</issue_title>
<issue_description>### What version are you using?

scaffold-stellar-frontend@0.0.1

What did you do?

1. Followed the "Getting Started" guide for Scaffold Stellar. https://developers.stellar.org/docs/tools/scaffold-stellar#prerequisites
2. Ran stellar scaffold init my-project.
3. Ran npm start to begin local development as instructed by the scaffold output.
4. Note: Docker Desktop was not installed/running on the machine because it was not listed as a prerequisite.

What did you expect to see?

I expected the local development environment (local network, contract deployment, and frontend) to start successfully, or to have been informed in the "Prerequisites" section that a Docker runtime is required for the default local development flow.

What did you see instead?

The process failed immediately during the stellar scaffold watch phase because it could not find a Docker daemon to start the local Stellar node.

Error Output:

[stellar] ℹ️  Starting local Stellar Docker container...
[stellar] ℹ️  Starting local network
[stellar] ⚠️  Failed to connect to Docker daemon at unix:///var/run/docker.sock.
[stellar] ℹ️  Attempting to connect to the default Docker Desktop socket at /Users/steph/.docker/run/docker.sock instead.
[stellar] Failed to start Stellar Docker container: DockerConnectionFailed(BollardErr(HyperLegacyError { err: hyper_util::client::legacy::Error(Connect, Os { code: 2, kind: NotFound, message: "No such file or directory" }) }))
[stellar] ❌ Build error: Failed to start docker container

Suggested Fix:
Add Docker to the list of Prerequisites on the documentation page. While experienced Stellar developers might know the CLI relies on the stellar/quickstart Docker image for local testing, new users following the tutorial for the first time are likely to encounter this "missing dependency" error.
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Docs: Add Docker to Prerequisites for Scaffold Stellar #2248

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[Copilot]

Pull request overview

Updates Scaffold Stellar documentation to explicitly list Docker as a prerequisite, preventing setup failures when stellar scaffold watch attempts to start a local network via the stellar/quickstart Docker image.

Changes:

• Added a Docker prerequisite row to the English Scaffold Stellar prerequisites table.
• Added the same Docker prerequisite row to both Spanish Scaffold Stellar doc locations.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
docs/tools/scaffold-stellar.mdx	Adds Docker to prerequisites for running a local Stellar network via stellar/quickstart.
i18n/es/docusaurus-plugin-content-docs/current/tools/scaffold-stellar.mdx	Mirrors the Docker prerequisite addition in Spanish.
i18n/es/docusaurus-plugin-content-docs/current/tools/developer-tools/scaffold-stellar.mdx	Mirrors the Docker prerequisite addition in the alternate Spanish path.

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💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The install link text is “Download Docker Desktop”, which is Mac/Windows-specific and can be misleading for Linux users (who typically install Docker Engine). Consider using a more general install label/link (e.g., “Get Docker” pointing to Docker’s official install docs) so the prerequisite applies across platforms.

Suggested change

	| [Docker](https://www.docker.com/get-started/) | For running a local Stellar network via the `stellar/quickstart` image | [Download Docker Desktop](https://www.docker.com/products/docker-desktop/) |
	| [Docker](https://www.docker.com/get-started/) | For running a local Stellar network via the `stellar/quickstart` image | [Get Docker](https://docs.docker.com/get-docker/) |

[Copilot]

El texto del enlace de instalación dice “Descargar Docker Desktop”, lo cual es específico de Mac/Windows y puede confundir a usuarios de Linux (donde normalmente se instala Docker Engine). Considera usar un texto/enlace más general (p. ej., “Obtener Docker” con el enlace oficial de instalación) para que el prerrequisito aplique en todas las plataformas.

Suggested change

	| [Docker](https://www.docker.com/get-started/) | Para ejecutar una red Stellar local mediante la imagen `stellar/quickstart` | [Descargar Docker Desktop](https://www.docker.com/products/docker-desktop/) |
	| [Docker](https://www.docker.com/get-started/) | Para ejecutar una red Stellar local mediante la imagen `stellar/quickstart` | [Obtener Docker](https://docs.docker.com/get-docker/) |

[Copilot]

El texto del enlace de instalación dice “Descargar Docker Desktop”, lo cual es específico de Mac/Windows y puede confundir a usuarios de Linux (donde normalmente se instala Docker Engine). Considera usar un texto/enlace más general (p. ej., “Obtener Docker” con el enlace oficial de instalación) para que el prerrequisito aplique en todas las plataformas.

Suggested change

	| [Docker](https://www.docker.com/get-started/) | Para ejecutar una red Stellar local mediante la imagen `stellar/quickstart` | [Descargar Docker Desktop](https://www.docker.com/products/docker-desktop/) |
	| [Docker](https://www.docker.com/get-started/) | Para ejecutar una red Stellar local mediante la imagen `stellar/quickstart` | [Obtener Docker](https://docs.docker.com/get-docker/) |