docs: fix broken links and layout (tendermint#7154)

This PR does a few minor touch ups to the docs

.gitignore

@@ -25,6 +25,7 @@ docs/_build
 docs/dist
 docs/node_modules/
 docs/spec
+docs/.vuepress/public/rpc
 index.html.md
 libs/pubsub/query/fuzz_test/output
 profile\.out

docs/roadmap/README.md

@@ -0,0 +1,6 @@
+---
+order: false
+parent:
+  title: Roadmap
+  order: 7
+---

docs/roadmap/roadmap.md

@@ -1,8 +1,5 @@
 ---
-order: false
-parent:
-  title: Roadmap
-  order: 7
+order: 1
 ---
 
 # Tendermint Roadmap

docs/tendermint-core/README.md

@@ -5,18 +5,20 @@ parent:
   order: 5
 ---
 
+# Overview
+
 This section dives into the internals of Go-Tendermint.
 
 - [Using Tendermint](./using-tendermint.md)
 - [Subscribing to events](./subscription.md)
 - [Block Structure](./block-structure.md)
 - [RPC](./rpc.md)
-- [Block Sync](./block-sync.md)
-- [State Sync](./state-sync.md)
-- [Mempool](./mempool.md)
+- [Block Sync](./block-sync/README.md)
+- [State Sync](./state-sync/README.md)
+- [Mempool](./mempool/README.md)
 - [Light Client](./light-client.md)
 - [Consensus](./consensus/README.md)
-- [Pex](./pex/README.md)
+- [Peer Exachange (PEX)](./pex/README.md)
 - [Evidence](./evidence/README.md)
 
 For full specifications refer to the [spec repo](https://github.com/tendermint/spec).

docs/tendermint-core/consensus/README.md

@@ -5,6 +5,7 @@ parent:
   order: 6
 ---
 
+# Consensus
 
 Tendermint Consensus is a distributed protocol executed by validator processes to agree on
 the next block to be added to the Tendermint blockchain. The protocol proceeds in rounds, where

docs/tools/remote-signer-validation.md

@@ -1,4 +1,4 @@
-# tm-signer-harness
+# Remote Signer
 
 Located under the `tools/tm-signer-harness` folder in the [Tendermint
 repository](https://github.com/tendermint/tendermint).