chore(nano): Replace svg with mermaid

[dmihalcik-virtru]

Proposed Changes

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[dmihalcik-virtru]

@jakedoublev Do you have any advice about how best to use Mermaid to recreate (or update) the nanoTDF diagrams?

Thanks!

[jakedoublev]

@dmihalcik-virtru It looks like the most complex one nanotdf.svg would probably fit well into a mermaid ERD. I personally find chatgpt to be useful for scaffolding initial mermaid diagrams like these (though I don't utilize file/image uploads).