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/subscriptions.md

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+# Subscriptions
+
+## Overview
+
+To interact with the subscription API, send websocket messages to <mark style="color:red;">`WEBSOCKET [SUBSCRIPTIONS_ENDPOINT]`</mark>.
+
+Subscription connections must set the `Sec-WebSocket-Extensions` header to include `permessage-deflate`.
+
+## Endpoints
+
+### Testnet:
+
+* <mark style="color:red;">`wss://gateway.test.nado.xyz/v1/subscribe`</mark>
+
+{% hint style="info" %}
+**Note**: You must send ping frames every 30 seconds to keep the websocket connection alive.
+{% endhint %}
+
+{% content-ref url="subscriptions/authentication" %}
+[authentication](https://docs.nado.xyz/developer-resources/api/subscriptions/authentication)
+{% endcontent-ref %}
+
+{% content-ref url="subscriptions/streams" %}
+[streams](https://docs.nado.xyz/developer-resources/api/subscriptions/streams)
+{% endcontent-ref %}
+
+{% content-ref url="subscriptions/events" %}
+[events](https://docs.nado.xyz/developer-resources/api/subscriptions/events)
+{% endcontent-ref %}
+
+{% content-ref url="subscriptions/rate-limits" %}
+[rate-limits](https://docs.nado.xyz/developer-resources/api/subscriptions/rate-limits)
+{% endcontent-ref %}