Update the playground to the latest bdk-cli

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "bdk-cli"]
+	path = playground/bdk-cli
+	url = https://www.github.com/bitcoindevkit/bdk-cli

playground/.gitignore

@@ -4,3 +4,4 @@ Cargo.lock
 bin/
 pkg/
 wasm-pack.log
+dist/

playground/README.md

@@ -1,69 +1,42 @@
-<div align="center">
+# BDK playground
 
-  <h1><code>wasm-pack-template</code></h1>
+The playground is a porting of certain functions of `bdk-cli` over wasm32,
+deployed at https://bitcoindevkit.org/bdk-cli/playground/
 
-  <strong>A template for kick starting a Rust and WebAssembly project using <a href="https://github.com/rustwasm/wasm-pack">wasm-pack</a>.</strong>
+## Compiling and running
 
-  <p>
-    <a href="https://travis-ci.org/rustwasm/wasm-pack-template"><img src="https://img.shields.io/travis/rustwasm/wasm-pack-template.svg?style=flat-square" alt="Build Status" /></a>
-  </p>
-
-  <h3>
-    <a href="https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html">Tutorial</a>
-    <span> | </span>
-    <a href="https://discordapp.com/channels/442252698964721669/443151097398296587">Chat</a>
-  </h3>
-
-  <sub>Built with 🦀🕸 by <a href="https://rustwasm.github.io/">The Rust and WebAssembly Working Group</a></sub>
-</div>
-
-## About
-
-[**📚 Read this template tutorial! 📚**][template-docs]
-
-This template is designed for compiling Rust libraries into WebAssembly and
-publishing the resulting package to NPM.
-
-Be sure to check out [other `wasm-pack` tutorials online][tutorials] for other
-templates and usages of `wasm-pack`.
-
-[tutorials]: https://rustwasm.github.io/docs/wasm-pack/tutorials/index.html
-[template-docs]: https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html
-
-## 🚴 Usage
-
-### 🐑 Use `cargo generate` to Clone this Template
-
-[Learn more about `cargo generate` here.](https://github.com/ashleygwilliams/cargo-generate)
+Update the [bdk-cli](./bdk-cli) submodule:
 
 ```
-cargo generate --git https://github.com/rustwasm/wasm-pack-template.git --name my-project
-cd my-project
+git submodule update --init --recursive
 ```
 
-### 🛠️ Build with `wasm-pack build`
+Compile bdk-cli using the right features and the WASM target:
 
 ```
-wasm-pack build
+cd bdk-cli
+RUSTFLAGS="-C opt-level=s -C strip=symbols" cargo build --release --no-default-features --features esplora-reqwest,async-interface,compiler --target wasm32-unknown-unknown
 ```
 
-### 🔬 Test in Headless Browsers with `wasm-pack test`
+From inside the `bdk-cli` directory, run `wasm-bindgen`
 
 ```
-wasm-pack test --headless --firefox
+wasm-bindgen --target bundler --out-dir target/wasm32-unknown-unknown/release/ target/wasm32-unknown-unknown/release/bdk-cli.wasm
 ```
 
-### 🎁 Publish to NPM with `wasm-pack publish`
+Come back to the playground directory, and build the javascript code:
 
 ```
-wasm-pack publish
+cd ..
+rm dist/*
+npm run build
 ```
 
-## 🔋 Batteries Included
+Last step! Now we substitute the old playground files with the freshly generated ones.
+```
+rm ../docs/.vuepress/public/bdk-cli/playground/*.wasm
+cp dist/* ../docs/.vuepress/public/bdk-cli/playground/
+```
 
-* [`wasm-bindgen`](https://github.com/rustwasm/wasm-bindgen) for communicating
-  between WebAssembly and JavaScript.
-* [`console_error_panic_hook`](https://github.com/rustwasm/console_error_panic_hook)
-  for logging panic messages to the developer console.
-* [`wee_alloc`](https://github.com/rustwasm/wee_alloc), an allocator optimized
-  for small code size.
+Now you can come back to the project root, and start the website following the instructions
+in the [`README.md`](../README.md)