Add a link to Nextflow extension on environment setup page

[odagayev]

Hi!

There should be a link to the Nextflow extension(https://marketplace.visualstudio.com/items?itemName=nextflow.nextflow) on this page (https://training.nextflow.io/envsetup/) so that users run into less syntax issues.

Ideally, we should also edit the Gitpod implementation so that it ships with this extension pre-installed as well.

Thanks!

[ewels]

GitPod already ships with it 👍🏻

training/.gitpod.yml

Line 49 in a0d86f0

- nextflow.nextflow # Nextflow syntax highlighting

and .devcontainer:

training/.devcontainer/devcontainer.json

Line 30 in a0d86f0

"nextflow.nextflow",