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.

README.md

@@ -19,9 +19,12 @@
 [![Build provenance](https://raw.githubusercontent.com/wickra-lib/.github/main/profile/badges/provenance.svg)](https://github.com/wickra-lib/wickra/attestations)
 [![Docs](https://raw.githubusercontent.com/wickra-lib/.github/main/profile/badges/docs.svg)](https://docs.wickra.org)
 [![Verified across 10 languages](https://raw.githubusercontent.com/wickra-lib/.github/main/profile/badges/verified.svg)](https://docs.wickra.org/FAQ#do-all-the-language-bindings-compute-the-same-values)
+[![Live demo](https://img.shields.io/badge/live%20demo-live.wickra.org-3b82f6)](https://live.wickra.org)
 
 **Streaming-first technical indicators. Install with `pip install wickra` — no system dependencies, zero third-party packages.**
 
+> **▶ 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`.
+
 Wickra is a multi-language technical-analysis library with a Rust core and
 native bindings for Python, Node.js and WASM, plus a C ABI that C, C++,
 C#, Go, Java, R and any other C-capable language links against. Every indicator is a