Complete rebrand: Polkadot→Pezkuwi, Substrate→Bizinikiwi

- Replace PolkadotConfig with PezkuwiConfig
- Replace SubstrateConfig with BizinikiwConfig
- Rename config module files (polkadot.rs→pezkuwi.rs, substrate.rs→bizinikiwi.rs)
- Update all documentation and examples
- All 165 files updated, cargo check passes

testing/wasm-lightclient-tests/tests/wasm.rs

@@ -1,7 +1,7 @@
 #![cfg(target_arch = "wasm32")]
 
 use futures_util::StreamExt;
-use pezkuwi_subxt::{client::OnlineClient, config::PolkadotConfig, lightclient::LightClient};
+use pezkuwi_subxt::{client::OnlineClient, config::PezkuwiConfig, lightclient::LightClient};
 use wasm_bindgen_test::*;
 
 wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);
@@ -46,16 +46,16 @@ async fn light_client_works() {
 /// We connect to an RPC node because the light client can struggle to sync in
 /// time to a new local node for some reason. Because this can be brittle (eg RPC nodes can
 /// go down or have network issues), we try a few RPC nodes until we find one that works.
-async fn connect_to_rpc_node() -> OnlineClient<PolkadotConfig> {
+async fn connect_to_rpc_node() -> OnlineClient<PezkuwiConfig> {
     let rpc_node_urls = [
-        "wss://rpc.polkadot.io",
+        "wss://rpc.pezkuwi.io",
         "wss://1rpc.io/dot",
-        "wss://polkadot-public-rpc.blockops.network/ws",
+        "wss://pezkuwi-public-rpc.blockops.network/ws",
     ];
 
     async fn do_connect(
         url: &str,
-    ) -> Result<OnlineClient<PolkadotConfig>, Box<dyn std::error::Error + Send + Sync + 'static>>
+    ) -> Result<OnlineClient<PezkuwiConfig>, Box<dyn std::error::Error + Send + Sync + 'static>>
     {
         let chainspec = pezkuwi_subxt::utils::fetch_chainspec_from_rpc_node(url).await?;
         let (_lc, rpc) = LightClient::relay_chain(chainspec.get())?;