docs: add Pezkuwi-SDK documentation

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

mermaid/substrate_with_frame.mmd

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+graph TB
+subgraph Substrate
+	direction LR
+	subgraph Node
+		Database
+		Networking
+		Consensus
+	end
+	subgraph Runtime
+		subgraph FRAME
+			direction LR
+			Governance
+			Currency
+			Staking
+			Identity
+		end
+	end
+	Node --runtime-api--> Runtime
+	Runtime --host-functions--> Node
+end