Remove redundant line from the docker configuration instructions in README.md

[RenaudBernier]

The README.md file shows these instructions to create the config.json file:

touch config.json
echo '{
    "$schema": "https://raw.githubusercontent.com/sourcebot-dev/sourcebot/main/schemas/v3/index.json",
    // Comments are supported.
    // This config creates a single connection to GitHub.com that
    // indexes the Sourcebot repository
    "connections": {
        "starter-connection": {
            "type": "github",
            "repos": [
                "sourcebot-dev/sourcebot"
            ]
        }
    }
}' > config.json

The touch command is redundant, as echo will create the file if it does not exist.

[msukkari]

Thanks for the suggestion but this really doesn't seem necessary