Your ROOT_URL in app.ini is https://git.cloudchain.link/ but you are visiting https://dash.bss.nz/open-source-mirrors/homepage/src/commit/bec1e5fff23ba6e3a971e6d6689689690c8887e6/docs/widgets/services/proxmoxbackupserver.md You should set ROOT_URL correctly, otherwise the web may not work correctly.
homepage/docs/widgets/services/proxmoxbackupserver.md

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title description
Proxmox Backup Server Proxmox Backup Server Widget Configuration

Allowed fields: ["datastore_usage", "failed_tasks_24h", "cpu_usage", "memory_usage"].

widget:
  type: proxmoxbackupserver
  url: https://proxmoxbackupserver.host:port
  username: api_token_id
  password: api_token_secret