docs: link the live in-browser demo (live.wickra.org) (#340)

* docs: link the live in-browser demo (live.wickra.org)

Adds a Live-demo badge + callout to the main README and a callout to all eight
binding READMEs, pointing at the wickra-live in-browser demo of all 514
indicators. DRAFT until live.wickra.org is deployed.

* ci: exclude live.wickra.org from lychee until the wickra-live site is deployed

* Revert "ci: exclude live.wickra.org from lychee until the wickra-live site is deployed"

This reverts commit 3809d4a3b3.

bindings/r/README.md

@@ -4,6 +4,8 @@
 [![codecov](https://codecov.io/gh/wickra-lib/wickra/branch/main/graph/badge.svg)](https://codecov.io/gh/wickra-lib/wickra)
 [![License: MIT OR Apache-2.0](https://img.shields.io/badge/license-MIT_OR_Apache--2.0-blue)](https://github.com/wickra-lib/wickra#license)
 
+> **▶ Live demo:** all 514 indicators over real Binance market data, computed live in your browser — **[live.wickra.org](https://live.wickra.org)** · zero backend, powered by `wickra-wasm`.
+
 **Streaming-first technical indicators for R, over the Wickra C ABI hub via `.Call`.**
 
 Wickra is a multi-language technical-analysis library with a Rust core and