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.

README.md

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+# Gift Guide
+
+Source content and build pipeline for "How To Get Your Stories In Front Of The Readers
+Who Need Them" — the lead-magnet PDF given away at reground.org/gift. Kept in its own
+repo because this content changes on its own schedule, independent of the reground-site
+deploys.
+
+Styled to match reground.org's dark theme (background, heading, and CTA colors are
+pulled directly from that site's CSS).
+
+## One-time setup
+
+You need `pandoc` and `weasyprint` on your `PATH`. Both are already used elsewhere on
+this machine; nothing else to install.
+
+## Building a PDF
+
+```sh
+make template.pdf              # the generic/base version
+make partners/<slug>.pdf        # a specific partnership's version
+make                            # rebuilds template.pdf + every partners/*.md that exists
+make clean                      # removes generated PDFs (never touches the .md sources)
+```
+
+`make` finds the source `.md` file automatically from the `.pdf` name you ask for, so
+building any filled-in template is just naming the PDF you want.
+
+## Starting a new partnership
+
+```sh
+cp template.md partners/<slug>.md
+```
+
+Edit the new file's title (front matter) and rewrite the opening/closing copy to bridge
+your angle with the partner's audience — the 3 Step sections and their photos are
+generally reusable as-is. Then:
+
+```sh
+make partners/<slug>.pdf
+```
+
+## Notes
+
+- The 4 photos in `images/` were extracted from the original PDF. They're intentionally
+  generic/illustrative (not specific to any one partnership) and don't need to change
+  per customization.
+- `template.html` renders the cover (title + byline + author photo) from the document's
+  YAML front matter — you don't need to hand-write that part in the body of each `.md`
+  file, just update the front matter.
+- `style.css` is the single source of truth for the visual theme. Edit it once and
+  `make all` rebuilds every partner PDF with the change.