Moves code walkthrough book chapters to docs (#629)

* replaced template blocks with code blocks in stages chapter

* replaced template blocks with code blocks in network chapter

* moved book sections to docs

* fix indentation in recover_signer codeblock

* remove unnecessary TODO comment in network.md

book/SUMMARY.md

@@ -7,44 +7,3 @@
 <!-- An overview of all the flags, how they work and how to configure the node   -->
 - [Configuring The Node]()
 - [Running Reth]()
-
-# A Tour Of Reth
-
-- [Database]()
-    - [codecs]()
-    - [libmdbx-rs]()
-    - [db](./db/README.md)
-- [Networking]()
-    - [P2P](./networking/p2p/README.md)
-        - [network](./networking/p2p/network/README.md)
-        - [eth-wire]()
-        - [discv4]()
-        - [ipc]()
-    - [RPC]()
-        - [rpc-api]()
-        - [rpc]()
-        - [rpc-types]()
-    - [Downloaders]()
-        - [bodies-downloaders]()
-        - [headers-downloaders]()
-- [Ethereum]()
-    - [executor]()
-    - [consensus]()
-    - [transaction-pool]()
-- [Staged Sync]()
-    - [stages](./stages/README.md)
-- [Primitives]()
-    - [primitives]()
-    - [rlp]()
-    - [rlp-derive]()
-- [Misc]()
-    - [interfaces]()
-    - [tracing]()
-    - [crate-template]()
-    - [examples]()
-
-
-
-# Design
-
-- [Goals](./design/goals.md)