layout: add section titles (#240)

spec/README.md

@@ -2,7 +2,7 @@
 order: 1
 title: Overview
 parent:
-  title: Tendermint Spec
+  title: Spec
   order: 7
 ---
 

spec/abci/README.md

@@ -1,5 +1,8 @@
 ---
-cards: true
+order: 1
+parent:
+  title: ABCI
+  order: 2
 ---
 
 # ABCI

spec/blockchain/readme.md

@@ -1,5 +1,8 @@
 ---
-order: false
+order: 1
+parent:
+  title: Blockchain
+  order: false
 ---
 
 # Blockchain

spec/consensus/readme.md

@@ -1,5 +1,8 @@
 ---
-cards: true
+order: 1
+parent:
+  title: Consensus
+  order: 4
 ---
 
 # Consensus

spec/core/readme.md

@@ -1,4 +1,9 @@
-# Core
+---
+order: 1
+parent:
+  title: Core
+  order: 3
+---
 
 This section describes the core types and functionality of the Tendermint protocol implementation.
 

spec/light-client/README.md

@@ -1,4 +1,9 @@
-# Light Client Protocol
+---
+order: 1
+parent:
+  title: Light Client
+  order: 5
+---
 
 NOTE: This specification is under heavy development and is not yet complete nor
 accurate.

spec/p2p/readme.md

@@ -1,5 +1,6 @@
 ---
-cards: true
+order: 1
+parent:
+  title: P2P
+  order: 6
 ---
-
-# P2P