Update outdated links in docs

[youyyytrok]

The changes correct broken or outdated external links in the documentation files to ensure users can navigate to the proper resources.

Changes introduced

• Updated outdated links to point to their correct locations:
  • Updated https://gnosis-safe.io to https://safe.global in access-control.adoc.
  • Fixed blog guide link in index.adoc.

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

[changeset-bot]

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Latest commit: 6d311a0

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