feat: Publish every library as Markdown and give each one its own link-preview card. (#2)

Author: gustavofreze

Makefile

@@ -67,7 +67,7 @@ preview: ## @setup Serve the built site, search included, on the development por
 	@echo "Built site at $(SITE_URL)"
 
 .PHONY: og-image
-og-image: ## @setup Draw the link-preview card into public/og-image.png
+og-image: ## @setup Draw the link-preview cards into public/og-image.png and public/og/
 	@docker run --rm -u $(HOST_USER) -e HOME=/tmp -v $(CURDIR):/app -w /app python:3.12-slim \
 		sh -c "pip install --quiet --no-cache-dir --user pillow==11.3.0 && python tools/og-image.py"
 

README.md

@@ -83,7 +83,8 @@ To serve the built site, search included, as it is published, run:
 make preview
 ```
 
-To draw the link-preview card into `public/og-image.png`, run:
+To draw the link-preview cards, `public/og-image.png` and one per library in `public/og/`, run the command
+below. Run it again after adding a library to the catalog:
 
 ```bash
 make og-image