Update plugins.json: add Achuan-2/siyuan-plugin-blockref-footnote

[Achuan-2]

If you are submitting a new bazaar package for the first time, please confirm the following information.

• The repository is public
• Include the appropriate open source license file LICENSE
• Does not involve infringing content, such as non-commercial font files

[github-actions]

Pull Request Check Report

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Add 1 Plugin Repo

achuan-2/siyuan-plugin-blockref-footnote

• Release that must exist
  • Current Latest Release
  • package.zip
• Files that must exist
  • plugin.json
  • icon.png
  • preview.png
  • README.md
• Attributes that must exist in plugin.json
  • name: siyuan-plugin-blockref-footnote
    • Is a valid name
    • Not conflict with other plugin name
  • version: 1.0.0
  • author: Achuan-2
  • url: https://github.com/Achuan-2/siyuan-plugin-blockref-footnote

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Add 0 Widget Repo

[88250]

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Thank you for your contribution. SiYuan will be more wonderful with you!