docs: polish README for mainnet readiness (develop) (#116)

* docs: polish README for mainnet readiness

Add CI and license badges, fix typo, reorder sections to lead with
"What's new in Signet?", and move semver note to the bottom.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: update component list for develop branch

Replace signet-db (removed on develop) with signet-host-reth and
signet-host-rpc which are new on this branch.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: init4samwise

README.md

@@ -1,35 +1,13 @@
 # Signet Node Components
 
+[![CI](https://github.com/init4tech/node-components/actions/workflows/rust.yml/badge.svg)](https://github.com/init4tech/node-components/actions/workflows/rust.yml)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)
+
 > **Note:** The `main` branch is in maintenance and bug-fix mode. The
 > `develop` branch contains current work.
 
 A collection of components for building the Signet node. These components
-implement core node functionality, but are potentially indepedently useful.
-
-## What's in the Components?
-
-- **signet-node-types** - Shim types wrapping reth's internal node types
-  system to make it more usable in Signet.
-- **signet-blobber** - Blob retrieval and parsing, using blob explorers,
-  Signet's Pylon, and the local node transaction API.
-- **signet-rpc** - An Ethereum JSON-RPC Server for Signet nodes. Makes heavy
-  use of reth internals.
-- **signet-db** - An extension of reth's database, providing a Signet-specific
-  database schema and utilities for working with Signet blocks and transactions.
-
-### Contributing to the Node Components
-
-Please see [CONTRIBUTING.md](CONTRIBUTING.md).
-
-[Signet docs]: https://signet.sh/docs
-
-## Note on Semver
-
-This repo is UNPUBLISHED and may NOT respect semantic versioning between tagged
-versions. In general, it is versioned to match the signet-sdk version with
-which it is compatible. I.e. `node-components@0.8.x` is expected to be
-compatible with any signet-sdk `0.8.x` version. However, a release of
-`node-components@0.8.1` may have breaking changes from `node-components@0.8.0`.
+implement core node functionality, but are potentially independently useful.
 
 ## What's new in Signet?
 
@@ -50,3 +28,30 @@ knowledge. Signet does not have a native token.
 Signet is just a rollup.
 
 See the [Signet docs] for more info.
+
+## What's in the Components?
+
+- **signet-node-types** — Shim types wrapping reth's internal node types
+  system to make it more usable in Signet.
+- **signet-blobber** — Blob retrieval and parsing, using blob explorers,
+  Signet's Pylon, and the local node transaction API.
+- **signet-rpc** — An Ethereum JSON-RPC Server for Signet nodes. Makes heavy
+  use of reth internals.
+- **signet-host-reth** — Reth ExEx implementation of the `HostNotifier` trait
+  for signet-node.
+- **signet-host-rpc** — RPC-based implementation of the `HostNotifier` trait
+  for signet-node.
+
+## Contributing
+
+Please see [CONTRIBUTING.md](CONTRIBUTING.md).
+
+## Note on Semver
+
+This repo is UNPUBLISHED and may NOT respect semantic versioning between tagged
+versions. In general, it is versioned to match the signet-sdk version with
+which it is compatible. I.e. `node-components@0.8.x` is expected to be
+compatible with any signet-sdk `0.8.x` version. However, a release of
+`node-components@0.8.1` may have breaking changes from `node-components@0.8.0`.
+
+[Signet docs]: https://signet.sh/docs