Add `StackOverflow` icon to the `SocialLinkIcon` type.

[Achintha444]

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

Hi team, currently there is no StackOverlfow icon in the SocialLinkIcon type, which makes it difficult for the developers to add their relevant StackOverflow links to their documentation sites.

Describe the solution you'd like

Add the StackOverflow icon to the SocialLinkIcon type,.

Describe alternatives you've considered

No response

Additional context

No response

Validations

• [X] Follow our Code of Conduct
• [X] Read the docs.
• [X] Read the Contributing Guidelines.
• [X] Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.

[brc-dd]

Use custom SVG. New icons won't be added unless there is significant demand.

https://vitepress.dev/reference/default-theme-config#sociallinks . You can get SVG from https://simpleicons.org/