Fix internal links in external-use.md

[pmoris]

The (relative) links on the page about external use of nf-core don't seem to work as intended. This should fix it I hope.

@netlify /docs/developing/external-use

[netlify]

✅ Deploy Preview for nf-core-docs ready!

Name	Link
🔨 Latest commit	bb6d5f8
🔍 Latest deploy log	https://app.netlify.com/projects/nf-core-docs/deploys/6a3512e48214550008c5b64e
😎 Deploy Preview	https://deploy-preview-4265--nf-core-docs.netlify.app/docs/developing/external-use
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for nf-core-main-site ready!

Name	Link
🔨 Latest commit	bb6d5f8
🔍 Latest deploy log	https://app.netlify.com/projects/nf-core-main-site/deploys/6a3512e42d5f710008b93c53
😎 Deploy Preview	https://deploy-preview-4265--nf-core-main-site.netlify.app/docs/developing/external-use
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[pmoris]

Hm. Still doesn't work in the preview deployment it seems.

For example, the first one (../nf-core-tools/CLI/pipelines/lint#linting-config) points to https://deploy-preview-4265--nf-core-main-site.netlify.app/nf-core-tools/CLI/pipelines/lint#linting-config now, but it should be https://deploy-preview-4265--nf-core-main-site.netlify.app/docs/nf-core-tools/cli/pipelines/list.

Are the paths relative to the content page, instead of to the current document?

EDIT: Odd. Changed it back and forth a few times, and now it does seem to work the way I'd expect it to.

[mashehu]

Thanks!