Add intro guide to docs

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Latest commit: 70d96e5bd57d69b400adfff4d7f1cf215ac31bc7

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Name	Status	Preview	Updated (UTC)
e2b-docs	✅ Ready (Inspect)	Visit Preview	Sep 30, 2023 4:51pm

1 Ignored Deployment

| Name | Status | Preview | Updated (UTC) | | :--- | :----- | :------ | :------ | | **e2b** | ⬜️ Ignored ([Inspect](https://vercel.com/e2b/e2b/5P2ejv1D4sGixo8Y9DPnmSKcDqZQ)) | | Sep 30, 2023 4:51pm |