docs: added guide for migrating to Unionvisor

[PoisonPhang]

Summary by CodeRabbit

• Documentation
  • Updated instructions for migrating an existing node to Unionvisor.
  • Updated Docker image reference for Unionvisor.
  • Updated alias uniond command for Unionvisor.

[coderabbitai]

Walkthrough

The changes involve updating the Docker image reference, adding migration instructions for Unionvisor, and modifying the alias uniond command to use UNIONVISOR_VERSION with additional parameters. Additionally, the exported variable UNIOND_VERSION is replaced with UNIONVISOR_VERSION.

Changes

File Path	Summary of Changes
docs/docs/06_joining_the_testnet/06_unionvisor.md	- Docker image reference updated to use ghcr.io/unionlabs/bundle-testnet-4:$UNIONVISOR_VERSION - Added migration instructions for Unionvisor - Modified alias uniond command to use UNIONVISOR_VERSION with --log-level off - Updated exported variable from UNIOND_VERSION to UNIONVISOR_VERSION

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