Add scientific-python-myst-theme

Vendor scientific-python/scientific-python-myst-theme at 9002ff6 with
copier. The footer grid reads its links and social icons from a JSON
file through the footer-items.mjs plugin.

The template ships the scientific-python.org link set, whose relative
paths do not exist on this site. footer_items.json carries the links
and icons from the Hugo footer on main instead, plus the Bluesky
account the main site links: About and Roadmap stay local, the other
five links point at scientific-python.org.

Assisted-by: claude-code:claude-opus-4-8
Assisted-by: claude-code:claude-fable-5-1 [3M1LY]

Author: lundybernard

assets/css/custom.css

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+# Changes here will be overwritten by Copier; NEVER EDIT MANUALLY
+_commit: 9002ff6
+_src_path: gh:scientific-python/scientific-python-myst-theme
+favicon: https://raw.githubusercontent.com/scientific-python/scientific-python.org/main/static/favicon.ico
+footer_items_json: assets/json/footer_items.json
+project_name: Learn Scientific Python
+project_url: learn.scientific-python.org

content/.copier-answers.yml

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+body {
+  display: flex;
+  flex-direction: column;
+  min-height: 100vh;
+}
+
+main {
+  min-height: 0;
+  flex: 1 0 auto;
+}
+
+.article.content {
+  /* Override 100vh from myst-theme:styles/typography.css so content div
+   * doesn't grow <main> to push the footer offscreen.
+   */
+  min-height: 0;
+}
+
+.footer {
+  /* Make footer "sticky" to page bottom (also the above flex rules), per
+   * the flexbox strategy described here:
+   *    https://css-tricks.com/couple-takes-sticky-footer/#aa-there-is-flexbox
+   * and here:
+   *    https://philipwalton.github.io/solved-by-flexbox/demos/sticky-footer/
+   * This solution does not require hardcoding a fixed footer height in the
+   * style rules.
+   */
+  flex-shrink: 0;
+  background: #013243;
+  color: white;
+  padding-left: 2rem;
+  padding-right: 2rem;
+
+  /* Outer content grid */
+  & .outer-grid {
+    /* logo, project description, link columns, social icons */
+    grid-template-columns: 2fr 6fr 8fr 3fr;
+    column-gap: 4rem;
+    align-items: center;
+    margin: 0rem 4rem;
+
+    & li {
+      list-style: none;
+    }
+  }
+
+  @media (max-width: 640px) {
+    & .outer-grid {
+      grid-template-columns: 1fr;
+      justify-items: start;
+    }
+  }
+
+  /* Heading colours */
+  & a,
+  h1,
+  h2,
+  h3,
+  h4,
+  h5,
+  h6 {
+    color: white;
+  }
+
+  & h1 {
+    font-size: 1.25rem;
+    font-weight: bold;
+  }
+  & .footer-links {
+    column-gap: 1.5rem;
+    line-height: normal;
+
+    & a {
+      color: white;
+      text-decoration-color: white;
+      inline-size: min-content;
+      display: inline-block;
+      text-wrap: nowrap;
+    }
+  }
+
+  & .footer-icons {
+    column-gap: 3rem;
+    row-gap: 1rem;
+
+    & img {
+      filter: invert(100%);
+      margin-bottom: 0.1rem;
+      margin-top: 0.1rem;
+      min-width: 1.75rem;
+      width: 1.75rem;
+    }
+  }
+}
+
+.footer-logo {
+  min-width: 60px;
+}
+
+/* Hide download button */
+.myst-fm-downloads-button {
+  display: none;
+}
+
+/* Set site title bold */
+.myst-home-link {
+  font-weight: bold;
+}
+
+/* Unsure where this CSS came from, but keeping it for now */
+/* --- Make layout feel less "book-ish" and closer to a website --- */
+.bd-main .bd-content .bd-article-container {
+  max-width: 900px; /* keep readable, less wide than default "docs" feel */
+}
+
+h1,
+h2,
+h3,
+h4 {
+  letter-spacing: -0.01em;
+}
+
+/* Slightly tighten the top spacing so it feels more like a marketing/docs site */
+.bd-header {
+  box-shadow: none;
+}
+
+/* If the left sidebar feels too dominant, reduce its visual weight */
+.bd-sidebar-primary {
+  border-right: 0;
+}
+
+.copyright {
+  font-size: smaller;
+}

content/assets/css/scientific-python.css

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+You can find more free icons at:
+
+- https://fonts.google.com/icons (Search and then click the SVG download button at the bottom of the right-hand column.)
+- https://simpleicons.org/
+
+Apache licensed, but with a notice at https://github.com/google/material-design-icons:
+
+> We'd love attribution in your app's about screen, but it's not required.