docs(understanding-airbyte): Add file sync and permission sync documentation (do not merge)

[devin-ai-integration]

This PR adds documentation for two Airbyte capabilities:

1. Airbyte File Sync - Explains how to transfer raw files between systems without parsing their contents
2. Airbyte Permission Sync - Describes the capability to maintain access controls when transferring data
3. Airbyte Unstructured Parsing - Describes how to parse document files into markdown.

Both pages include:

• Overview of the capability
• How it works
• Supported connectors
• Usage instructions
• Limitations
• Technical implementation details
• Future enhancements

The PR also adds vanity URL redirects for easier discovery.

Link to Devin run: https://app.devin.ai/sessions/620a617ffafc441391b9d0373365a384
Requested by: @aaronsteers

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Name	Status	Preview	Comments	Updated (UTC)
airbyte-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 15, 2025 6:26pm

[devin-ai-integration]

🤖 Devin AI Engineer

Original prompt from Aaron:

@Devin - Please look for a documentation page about file transfer capabilities in the main airbyte repo. I don't believe we have one yet. If not, we're going to create one.

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[ian-at-airbyte]

(aside) @aaronsteers we actually already have a place for this information, and file transfers are covered: https://docs.airbyte.com/using-airbyte/delivery-methods

Rather than creating new pages, I think we should repurpose/merge and add the access control info.

[aldogonzalez8]

(aside) @aaronsteers we actually already have a place for this information, and file transfers are covered: https://docs.airbyte.com/using-airbyte/delivery-methods

Rather than creating new pages, I think we should repurpose/merge and add the access control info.

nit: I would suggest to convert Delivery Methods to an accordion menu/Collapsible Section with new pages for:

• Replicate records.
  1. Airbyte Structured Parsing
  2. Airbyte Unstructured Parsing
• Airbyte File Sync/Copy raw files
• Airbyte Permission Sync

I feel it gives some consistency. I'm excited about seeing what the docs update is!