Set up gift-guide as its own repo with a pandoc+weasyprint build pipeline

Converts the lead-magnet PDF from a Google Slides export into an editable
markdown template, styled to match reground.org's dark theme, with a
Makefile convention (make partners/<slug>.pdf) for producing per-partnership
customized versions.

style.css

@@ -0,0 +1,97 @@
+/* Matches reground.org's dark theme tokens, read from
+   reground-site/assets/css/main.css + extended/custom.css */
+
+@page {
+  size: Letter;
+  margin: 0.75in;
+  background: #1c1917;
+}
+
+html, body {
+  background: #1c1917;
+  color: #f0ebe3;
+  font-family: "Open Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
+  line-height: 1.6;
+  margin: 0;
+}
+
+h1, h2, h3 {
+  font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
+  color: #8fa8d1;
+  line-height: 1.25;
+}
+
+a {
+  color: #8fa8d1;
+}
+
+/* Cover block, generated by template.html from the document title/author */
+.cover {
+  background: #4a6fa5;
+  color: #f0ebe3;
+  margin: -0.75in -0.75in 0;
+  padding: 2in 0.75in 1in;
+  page-break-after: always;
+}
+
+.cover-title {
+  color: #ffffff;
+  font-size: 2.4rem;
+  margin: 0 0 1rem;
+}
+
+.cover-byline {
+  color: #f0ebe3;
+  opacity: 0.9;
+  font-size: 1.1rem;
+}
+
+.cover .author-photo {
+  width: 90px;
+  border-radius: 50%;
+  margin: 1.5rem 0 0;
+}
+
+/* One Step per page, like the original PDF */
+h2 {
+  page-break-before: always;
+  font-size: 1.5rem;
+}
+
+h2:first-of-type {
+  page-break-before: avoid;
+}
+
+img {
+  max-width: 100%;
+  border-radius: 0.5rem;
+  display: block;
+  margin: 1.5rem 0;
+}
+
+.closing {
+  page-break-before: always;
+  text-align: center;
+}
+
+.closing .author-photo {
+  width: 100px;
+  border-radius: 50%;
+  margin: 0 auto 1rem;
+}
+
+.closing p {
+  margin: 0.5rem 0;
+}
+
+/* CTA link styled as a button, matching the site's .btn */
+.cta-button {
+  display: inline-block;
+  margin-top: 1.5rem;
+  padding: 0.75rem 1.5rem;
+  border-radius: 0.5rem;
+  background: #2dd4c4;
+  color: #0f1115;
+  font-weight: 600;
+  text-decoration: none;
+}