docs: added deployment

Author: onmax

README.md

@@ -116,12 +116,8 @@ The Validators API provides endpoints to retrieve validator information for inte
 
 The Validators Dashboard is a simple Nuxt application that displays all validators along with their scores. You can access the dashboard here: https://validators-api-mainnet.pages.dev/
 
-## Development
-
-```bash
-pnpm install
-pnpm dev
-```
+> [!TIP]
+> Check also the [deployment](#deployment) section to learn how to access to the `testnet` and `preview` environments.
 
 ## How the API works
 
@@ -183,11 +179,28 @@ To learn more about the algorithm the calculation of the score, check:
 - [Documentation](./packages/nimiq-validator-trustscore/README.md).
 - [`nimiq-validator-trustscore`](https://www.nimiq.com/developers/learn/validator-trustscore) package.
 
-#### Development
+## Development
 
 Once it is cloned and installed the dependencies, you must run:
 
 ```bash
 pnpm db:generate
 pnpm dev # or pnpm dev:local to use the local database
 ```
+
+## Deployment
+
+The deployment is handled by [`NuxtHub Action`](./.github/workflows/nuxt-hub.yml).
+
+There are 4 different environments:
+
+| Nuxt Hub Env | GitHub Env           | Dashboard URL                                                              | Trigger                       |
+| ------------ | -------------------- | -------------------------------------------------------------------------- | ----------------------------- |
+| `production` | `production-mainnet` | [Validators API Mainnet](https://validators-api-mainnet.pages.dev)         | Push to `main` branch         |
+| `production` | `production-testnet` | [Validators API Testnet](https://validators-api-testnet.pages.dev)         | Push to `main` branch         |
+| `preview`    | `preview-mainnet`    | [Validators API Mainnet Preview](https://validators-api-preview.pages.dev) | Push any commit to any branch |
+| `preview`    | `preview-testnet`    | [Validators API Testnet Preview](https://validators-api-preview.pages.dev) | Push any commit to any branch |
+
+Each Nuxt Hub environment has its own database, so effectively we have 4 different databases and there 4 tasks in the [`sync.yml`](./.github/workflows/sync.yml) workflow that are responsible for syncing the data from the Nimiq network to the database.
+
+**Write operations to `main` are restricted**, only via PR.