Add social image

[nohwnd]

Card reuses the homepage hero: same gradient, same turtle, same copy. 1200x630.

themeConfig.image sets og:image and twitter:image on every page, and twitter:card is already summary_large_image by default, so nothing else is needed. Verified in build/index.html and in a docs page.

I kept the source at static/img/social-card.svg so the text can be changed later without redrawing it. It is not used by the site, drop it if you think it is clutter.

Jpg because png of the same card is 600 kB and this one is 84 kB.

Fix #419

🤖

[fflaten]

I like it 👍

Unable to test platform previews with online tools because og:image tag uses absolute paths and currently points to pester.dev. Let's just merge and see :)

---

Or if you want to get fancy, extend netlify.toml with

[context.deploy-preview.environment]
  IS_NETLIFY_PREVIEW = "true"

and docusaurus.config.js with:

const isPreview = process.env.IS_NETLIFY_PREVIEW === 'true';

// Use Netlify preview domain for PRs, else production domain
const siteUrl = isPreview 
  ? process.env.DEPLOY_PRIME_URL 
  : 'https://pester.dev';

const config = {
  ...
  url: siteUrl,
  noIndex: isPreview,

[nohwnd]

@fflaten merged!

[fflaten]

Looks good! Thanks.
https://www.opengraph.to/u/pester.dev/docs/commands/Should-BeEquivalent