Make deno lint Pass

[ebebbington]

Summary

What: If you run deno lint, we will most likely have a whole bunch of errors. This issue to fix these errors by correctly formatting code, and abiding by Deno's standards

Why: It would be good to make sure the code follows either: Deno's best practices, coding standards, or general best practices. It's a Deno project so it makes sense to utilise their tools on making the code Deno-like

Acceptance Criteria

• deno lint is added to the master.yml CI, as a new block (similar to how we use deno fmt --check on some repositories)
• deno lint produces no errors

Resources

Deno Lint Documentation

[Guergeiro]

Relevant: drashland/drash#264 (comment)