Update resource-nodes per doc sprint.

[rosiel]

Purpose / why

"Local" (non-forked) PR so that we can use secret variables. This replaces #1841

Replace this text - Name some folks who may be interested, if documentation related mention @Islandora/documentation, or, if unsure, @Islandora/8-x-committers

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Checklist

Pull-request reviewer should ensure the following

• Does this PR link to related issues?
• Does the proposed documentation align with the Islandora Documentation Style Guide?
• Are the changes accurate, useful, free of typos, etc?
• Does this PR update the last updated on date on the documentation page?

Person merging should ensure the following

• Does mkdocs still build successfully? (This is indicated by TravisCI passing. To test locally, and see warnings, see How To Build Documentation.)
• If pages are renamed or removed, have all internal links to those pages been fixed?
• If pages are added, have they been linked to or placed in the menu?
• Did the PR receive at least one approval from a committer, and all issues raised have been addressed?

[rosiel]

This PR was a test; see #1845 which will allow #1841 to pass.