Support a target option for social links.

[ajiho]

Is your feature request related to a problem? Please describe.

Sometimes I prefer to place all social/contact information on a dedicated page, since it allows for richer descriptions and additional context. However, social links currently always open in a new tab.

Describe the solution you'd like

It would be great if socialLinks could support a target option, similar to themeConfig.nav for example:

themeConfig: {
  socialLinks: [
    {
      icon: "github",
      link: "https://github.com/ajiho",
      target: "_blank",
    },
    {
      icon: {
        svg: "<svg>...</svg>",
      },
      ariaLabel: "wechat",
      link: "/contact",
      target: "_self",
    },
  ];
}

This would provide more flexibility, especially for links that point to internal pages.

Describe alternatives you've considered

No response

Additional context

No response

Validations

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• Read the docs.
• Read the Contributing Guidelines.
• Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.