Add Nado documentation and examples, including new API endpoints, FAQs, and guides for using the TypeScript SDK. Update .env.example with additional configuration options.

docs/nado/developer-resources/api.md

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+# API
+
+## Overview
+
+Nado's API is divided into the following categories:
+
+1. A **websocket/REST** API (**gateway**) that supports writes (executes) and polling (queries).
+2. A **subscriptions** API that allows to subscribe to live data feeds.
+3. An **indexer** API (**archive**) that allows you to query historical data.
+4. A **trigger** API that allows to execute orders only under specified price conditions.
+
+{% hint style="info" %} <mark style="color:purple;">**NOTE**</mark>: To contact the Nado team with any questions or inquiries about Private Gateway connections, such as increased limits, please reach out on the Telegram channel below:
+
+* **Telegram Group =** TBD
+  {% endhint %}
+
+{% content-ref url="api/gateway" %}
+[gateway](https://docs.nado.xyz/developer-resources/api/gateway)
+{% endcontent-ref %}
+
+{% content-ref url="api/subscriptions" %}
+[subscriptions](https://docs.nado.xyz/developer-resources/api/subscriptions)
+{% endcontent-ref %}
+
+{% content-ref url="api/archive-indexer" %}
+[archive-indexer](https://docs.nado.xyz/developer-resources/api/archive-indexer)
+{% endcontent-ref %}
+
+{% content-ref url="api/trigger" %}
+[trigger](https://docs.nado.xyz/developer-resources/api/trigger)
+{% endcontent-ref %}