Ability to embed a document/object

[aronmolnar]

Discussed in https://github.com/Syslifters/sysreptor/discussions/41

^{Originally posted by silent6trinity May 28, 2023} When writing reports, I run into situations where I need to embed a file into a finding or a large scope list within the Scope section. Instead of having to manually list every asset out within markdown, it'd be nice to have a way to embed an actual document into the report.