[website] Use a dedicated social card for link previews

Assessment

Research direction

Description

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Description

The website currently uses the transparent horizontal colored_logo.png as the default Open Graph and Twitter image. Platforms that render compact or square thumbnails can crop it to only part of the wave and wordmark.

Use a dedicated 1200 x 630 social card with the existing Fluss logo centered inside a square-safe area. Update the Docusaurus default themeConfig.image so pages without custom images use it.

Expected result:

• The complete Fluss logo remains visible in wide and square-cropped previews.
• og:image and twitter:image point to the dedicated social card.
• The card is verified in Facebook, X / Twitter, LinkedIn, and Slack preview layouts.

Preview

Facebook

X / Twitter

LinkedIn

Slack

Willingness to contribute

• I'm willing to submit a PR!

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