feat: add Leptos Web Framework to Web Development (#7398)

src/data/roadmaps/rust/content/108-web-development/106-leptos.md

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+# Leptos
+
+Leptos is a full-stack, isomorphic Rust web framework leveraging fine-grained reactivity to build declarative user interfaces.
+
+Learn more from the following resources:
+
+- [@official@Website](https://leptos.dev/)
+- [@official@Leptos Documentation](https://book.leptos.dev/)
+- [@opensource@Leptos](https://github.com/leptos-rs/leptos)
+- [@video@YouTube](https://www.youtube.com/watch?v=aQOFJQ2JkvQ&list=PLg4xWRFolJIo0lZawIlEaYr180e1w-ZUH)