Add built-in OpenCollective support to socialLinks

[ST-DDT]

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

Receiving donations is one of the hardest problems for small projects/sites.

Describe the solution you'd like

Having a OpenCollective link on the page hopefully helps with that (even if very little)

A SVG for that can be found here: https://github.com/simple-icons/simple-icons/blob/develop/icons/opencollective.svg

Describe alternatives you've considered

Manually add the OpenCollective link to the list.

• docs: add donate links faker-js/faker#2806

Additional context

No response

Validations

• Follow our Code of Conduct
• 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.

[brc-dd]

Ah, we are trying to avoid adding new icons to the core because they can't be tree shaken and end up in the bundle for everyone (even if they aren't using it). If this issue gets significant upvotes we would add it, but until then I'd recommend using the icons from https://simpleicons.org:

<svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>Open Collective</title><path d="M12 0C5.373 0 0 5.373 0 12s5.373 12 12 12c2.54 0 4.894-.79 6.834-2.135l-3.107-3.109a7.715 7.715 0 1 1 0-13.512l3.107-3.109A11.943 11.943 0 0 0 12 0zm9.865 5.166l-3.109 3.107A7.67 7.67 0 0 1 19.715 12a7.682 7.682 0 0 1-.959 3.727l3.109 3.107A11.943 11.943 0 0 0 24 12c0-2.54-.79-4.894-2.135-6.834z"/></svg>

Docs: https://vitepress.dev/reference/default-theme-config#sociallinks