Duplication of onboarding information in the guide

[lwasser]

"Onboarding editors & reviewers" and "Finding reviewers" is located in multiple places. Recommend consolidating to one place :)

• Onboarding editors & reviewers

  • https://www.pyopensci.org/software-peer-review/how-to/onboarding-guide.html

  • https://www.pyopensci.org/software-peer-review/how-to/editors-guide.html#onboard-reviewers - this section should link to previous link

• Finding reviewers

  • https://www.pyopensci.org/software-peer-review/how-to/finding-reviewers.html

  • https://www.pyopensci.org/software-peer-review/how-to/editors-guide.html#identify-scientific-python-package-reviewers

This section is also duplicated as a section title and a page title, which makes me think that maybe "Editor" guide needs to be a section with multiple pages (as i assume all of them eventually will need to be:

• Editor Guide

  • Position Description

  • Review Checklist

  • Finding Reviewers

  • Onboarding Reviewers

Originally posted by @sneakers-the-rat in #252