docs: add Filecoin Pin concept and quickstart

[nijoe1]

Adds Filecoin Pin to the docs:

• Core Concepts → Filecoin Pin: what it is, how it works, and how it fits the Filecoin Onchain Cloud.
• Getting Started → Quick Start with Filecoin Pin: install the CLI, connect a wallet, deposit storage credit, and pin a first file.

Closes #815

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	synapse-dev	f4c8839	Commit Preview URL Branch Preview URL	Jun 03 2026, 08:15 AM

[Copilot]

Pull request overview

Adds end-user documentation for Filecoin Pin to the docs site, covering both the conceptual overview and a CLI-based quickstart, aligning with Issue #815’s request to introduce Filecoin Pin within the Filecoin Onchain Cloud docs.

Changes:

• Added a Getting Started quickstart page that walks through installing the CLI, connecting a wallet, funding payments, pinning, and retrieving content.
• Added a Core Concepts page describing what Filecoin Pin is, how it works, and who it’s for, with links into existing FOC concepts.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
docs/src/content/docs/getting-started/filecoin-pin.mdx	New quickstart guide for installing/using the Filecoin Pin CLI end-to-end.
docs/src/content/docs/core-concepts/filecoin-pin.mdx	New conceptual overview page situating Filecoin Pin within Filecoin Onchain Cloud.

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[BigLep]

@nijoe1 : how does this relate to https://docs.filecoin.io/builder-cookbook/filecoin-pin/getting-started ? Are we wanting to have duplicative content or should we add a pointer from docs.filecoin.cloud to this document?