trustless vault whitepaper & Bitgo staking status update

[web3jenks]

No description provided.

[Copilot]

Pull Request Overview

This PR adds a new research paper on trustless Bitcoin vaults to the documentation and updates Bitgo's staking status. It enhances the documentation site with a whitepaper on Bitcoin-charged crypto economy and reflects current platform support status.

• Adds a new research paper on trustless Bitcoin vaults with abstract and download link
• Updates Bitgo's status from unsupported to supported in the BTC staking tools table
• Improves unbonding documentation with clarification on timing and potential delays

Reviewed Changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docusaurus.config.js	Adds redirect from old baby stakers URL to new location
docs/stakers/btc_stakers/native_staking/unbonding_via_web.mdx	Clarifies unbonding timing and adds note about potential delays
docs/stakers/btc_stakers/btc_staking_tools.mdx	Updates Bitgo support status from ❌ to ✅
docs/guides/specifications/staking_transactions.mdx	Updates default branch reference and removes v4.x version
docs/guides/research/btc_trustless_vault.mdx	Adds new research paper on trustless Bitcoin vaults

Comments suppressed due to low confidence (1)

docs/stakers/btc_stakers/native_staking/unbonding_via_web.mdx:28

• The timing information is contradictory. The text states 301 Bitcoin blocks (~2 days) but then says it typically takes around one week. This creates confusion about the actual timeframe.

## Step 3: Wait for the Unbonding Period and Withdraw

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