docs(README): add section for apps in the monorepo and Docker support

Author: Ansonhkg

README.md

@@ -96,6 +96,10 @@ git commit -m "chore: release v0.0.1"
 pnpm changeset publish
 ```
 
+# Apps
+
+This monorepo contains two apps: [Lit Auth Server](./apps/lit-auth-server/README.md) and [Lit Login Server](./apps/lit-login-server/README.md).Both apps support Docker builds.
+
 ## Releasing Docker Images
 
 - Trigger the `Release Docker Images` GitHub Action (`.github/workflows/release-docker-images.yml`) from the Actions tab once the desired changes are on the branch you want to release from.

apps/lit-auth-server/README.md

@@ -21,3 +21,7 @@ node ./dist/apps/lit-auth-server/main.cjs
 ```
 nx run lit-auth-server:docker-build
 ```
+
+# Deploy on Railway
+
+[![Deploy on Railway](https://railway.com/button.svg)](https://railway.com/deploy/OYOevk?referralCode=RP1REI&utm_medium=integration&utm_source=template&utm_campaign=generic)

apps/lit-login-server/README.md

@@ -21,3 +21,7 @@ node ./dist/apps/lit-login-server/main.cjs
 ```
 nx run lit-login-server:docker-build
 ```
+
+# Deploy on Railway
+
+[![Deploy on Railway](https://railway.com/button.svg)](https://railway.com/deploy/RO0wsZ?referralCode=RP1REI&utm_medium=integration&utm_source=template&utm_campaign=generic)