Bootstrap gh-pages branch for PR preview hosting

Author: timtreis

index.html

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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>spatialdata-plot-notebooks — PR previews</title>
+  <style>
+    body { font-family: system-ui, sans-serif; max-width: 720px; margin: 4em auto; padding: 0 1em; color: #222; line-height: 1.5; }
+    code { background: #f4f4f4; padding: 0.1em 0.3em; border-radius: 3px; }
+    a { color: #06c; }
+  </style>
+</head>
+<body>
+  <h1>spatialdata-plot-notebooks — PR previews</h1>
+  <p>This branch hosts rendered docs previews for open pull requests.</p>
+  <p>Each PR's preview lives at <code>./pr-&lt;N&gt;/</code> and is linked from a comment on the PR itself. There is no index of all previews; follow the link in your PR.</p>
+  <p>For the published docs, see the <a href="https://spatialdata.scverse.org/projects/plot/en/latest/gallery.html">spatialdata-plot gallery</a>.</p>
+</body>
+</html>