docs: add Pezkuwi-SDK documentation

- Technical documentation
- SDK guides
- Architecture overview
- Whitepaper
- Contributor guides

mermaid/state.mmd

@@ -0,0 +1,16 @@
+flowchart TB
+    subgraph Node[Node's View Of The State 🙈]
+        direction LR
+        0x1234 --> 0x2345
+        0x3456 --> 0x4567
+        0x5678 --> 0x6789
+        :code --> code[wasm code]
+    end
+
+    subgraph Runtime[Runtime's View Of The State 🙉]
+        direction LR
+        ab[alice's balance] --> abv[known value]
+        bb[bob's balance] --> bbv[known value]
+        cb[charlie's balance] --> cbv[known value]
+        c2[:code] --> c22[wasm code]
+    end