Reusable CTA banners

Define a reusable include with variants (banner / sidebar / inline), pull content from either
(a) a named CTA in _data/ctas.yml
b) page-level overrides in front matter.

Then drop the include where you want it (top, sidebar, inline). This gives you global control + page-specific flexibility.

Steps:

1) Create a CTA catalog

_data/ctas.yml: reusable, named CTAs you can reference across pages.

data_engineering_zoomcamp:
  title_text: "Start Data Engineering Zoomcamp"
  description: Want to learn data engineering? DE Zoomcamp ...
  cta_text: "Register now"
  url: "/zoomcamp/"
  target: "_self"

2) A single include that supports variants + overrides

_includes/cta.html

3) Minimal styles (three variants)

Add to your CSS:

/* Banner (top) */

/* Sidebar (card-like) */

/* Inline (within article body) */

4) How to place CTAs

5) Per-page overrides (front matter)

If a page needs a unique CTA without inventing a new catalog entry:

---
title: "ML Zoomcamp: Module 5"
cta:
---

6) Define which pages should have which CTAs

Start with the requested _data/ctas.yml and _includes/cta.html paths, then locate the site's CSS and the pages that should receive CTAs. Done means the catalog, banner/sidebar/inline variants, page-level overrides, and page placement rules described in the issue are defined and usable.