fix(app/metrics): SVGs broken on markdown templates

### Discussed in https://github.com/lowlighter/metrics/discussions/1314

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<sup>Originally posted by **Andre601** December 13, 2022</sup>
No real explanation needed. Happened after updating to 3.30

![grafik](https://user-images.githubusercontent.com/11576465/207451514-45712659-9226-4692-a430-cec6d7e9d8a7.png)
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