Example: How to connect to parachain (#1043)

* parachain rpc lists

* guide almost done

* add the 3rd config

* subscribe to block with configs

* delete table file

* spaces instead of tabs

* remove original ajuna example

* zombienet setup

* nft minting example

* include port, use different names

* link the example from the book

* format book

* add config creation to book, simplify example structure

* fix the nft creation script

* fix doc ref

* fixing links to foreign crates

* fix table formatting

* include nits

* move more docs to book, and simplify parachain-example

* another pass over docs and link to exampels from guide

* nit: adjust comment to numbers

* teeny README fix for parachain-example

* fix command in readme

* add CI for examples and fix parachain-example bug I left in

* add target arch

* cargo fmt

* make CI not fail

* remove index from docs

---------

Co-authored-by: James Wilson <james@jsdw.me>

subxt/src/config/mod.rs

@@ -135,6 +135,14 @@ mod substrate_impls {
         }
     }
 
+    impl Hasher for sp_runtime::traits::BlakeTwo256 {
+        type Output = H256;
+
+        fn hash(s: &[u8]) -> Self::Output {
+            <Self as sp_core::Hasher>::hash(s)
+        }
+    }
+
     impl Hasher for sp_core::KeccakHasher {
         type Output = H256;
 
@@ -142,4 +150,12 @@ mod substrate_impls {
             <Self as sp_core::Hasher>::hash(s)
         }
     }
+
+    impl Hasher for sp_runtime::traits::Keccak256 {
+        type Output = H256;
+
+        fn hash(s: &[u8]) -> Self::Output {
+            <Self as sp_core::Hasher>::hash(s)
+        }
+    }
 }