Delete content-modeling-guide.md

[ContentBrewmaster]

Very incomplete. Not useful!

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📚 Documentation preview 📚: https://civicactions-handbook--1164.org.readthedocs.build/en/1164/

[github-actions]

Potential file deletion - missing nav update / redirect

• There appear to be deleted files in this pull request, but the mkdocs.yml nav or redirect.yml have not been modified.
• If pages were deleted, please edit mkdocs.yml to remove the page from the menu, edit redirect.yml to add redirects (if there is a new location). You may also need to remove links to the file in other pages.
• If not, feel free to ignore this message.

[dmundra]

@ContentBrewmaster I updated the redirects and removed the deleted page and redirected the renamed page.