Delete Makefile

[ghost]

@mre is still needed?

[thomas-zahner]

Personally, I would update it instead. I think of it as documentation and utility. Especially in the lychee project itself I often use make lint, make build and similar. Typing make you don't have to remember the details, e.g. if we use npm or pnpm and I don't have to read the README.

If we decide to update it, I would rename run dev to watch or just dev.

.PHONY: watch
watch: ## Run webserver and watch for changes
	pnpm run dev