Add glances filesystem graph

[benphelps]

Proposed change

Adds a fs metric type, to show filesystem usage as reported by glances. This is for the graphs widget.

Type of change

• New service widget
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (please explain)

Checklist:

• If adding a service widget or a change that requires it, I have added a corresponding PR to the documentation here:
• If adding a new widget I have reviewed the guidelines.
• If applicable, I have checked that all tests pass with e.g. pnpm lint.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.

[benphelps]

Doc commit here: benphelps/homepage-docs@b500259

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new discussion or issue for related concerns.