Docs: Improve index page and add Makefile clean target

Makefile

@@ -1,10 +1,15 @@
-.PHONY: build-docs docs preview help
+.PHONY: build-docs docs preview clean help
 
 help:
 	@echo "Available targets:"
 	@echo "  build-docs  - Build the Sphinx documentation"
 	@echo "  docs        - Build and serve documentation with auto-reload"
-	@echo "  preview     - Build and preview documentation in browser"
+	@echo "  preview     - Clean, build and preview documentation in browser"
+	@echo "  clean       - Remove the documentation build directory"
+
+clean:
+	@echo "Cleaning documentation build directory..."
+	rm -rf docs/_build
 
 build-docs:
 	@echo "Building documentation..."
@@ -15,7 +20,7 @@ docs: build-docs
 	@echo "Press Ctrl+C to stop the server"
 	cd docs/_build/html && uv run python -m http.server 8001
 
-preview: build-docs
+preview: clean build-docs
 	@echo "Starting documentation server with auto-reload..."
 	@echo "Documentation will be available at http://127.0.0.1:8001"
 	uv run sphinx-autobuild docs docs/_build/html --port 8001 --open-browser

docs/_static/custom.css

@@ -5,7 +5,6 @@
 /* Enhanced code blocks */
 .highlight {
     border-radius: 8px;
-    margin: 1.5em 0;
 }
 
 div.highlight pre {

docs/api-quick-reference.md

@@ -273,6 +273,5 @@ ls .ml-dash/project/experiment/files/
 
 ## See Also
 
-- [Getting Started](getting-started.md)
 - [Complete Examples](complete-examples.md)
 - [Runnable Examples](examples.md)