📝 Add cancel subscription doc

apps/docs/docs/workspace/subscription.md

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+---
+sidebar_position: 3
+---
+
+# Subscription
+
+## Upgrade plan
+
+In order to upgrade your workspace plan and increase your monthly limits, you need to open the `Settings & Members` modal in your homepage and navigate on the `Billing & Usage` tab.
+
+This tab displays your bots total usage, your current plan and paid invoices.
+
+<img src="/img/workspace/billing.jpeg" alt="Billing and usage tab" />
+
+You can choose to upgrade to your desired plan here.
+
+## Cancel plan
+
+In order to cancel your workspace plan, you need to open the `Settings & Members` modal in your homepage and navigate on the `Billing & Usage` tab.
+
+There, you should see a `Billing portal` button. Clicking on it will redirect you to the billing portal where you can manage and cancel your subscription.