New unresolved references

[leamas]

Antora 3.0 reports following errors; some but not all are about the plugins manual:

4:05:38.412] WARN: logger not configured; creating logger with default settings
[14:05:39.357] INFO (asciidoctor): possible invalid reference: Preparations
    file: manual/modules/ROOT/pages/InstallConfigure/GithubPreps.adoc
    source: https://github.com/Rasbats/managed_plugins (refname: main, start path: manual)
[14:05:39.389] ERROR (asciidoctor): target of xref not found: Alternative-Workflow.adoc
    file: manual/modules/ROOT/pages/InstallConfigure/Builders/IntroCloudServiceChanges.adoc
    source: https://github.com/Rasbats/managed_plugins (refname: main, start path: manual)
[14:05:39.410] ERROR (asciidoctor): target of xref not found: aisradar:ROOT:index.adoc
    file: manual/plugins/modules/ROOT/pages/index-main.adoc
    source: https://github.com/opencpn-manuals/plugins (refname: main, start path: manual/plugins)
[14:05:39.954] ERROR (asciidoctor): target of image not found: ../../software/deviation.png
    file: manual/modules/ROOT/pages/deviation_curve.adoc
    source: https://github.com/opencpn-manuals/Deviation_pi (refname: master, start path: manual)
[14:05:40.508] ERROR (asciidoctor): target of image not found: pencil.png
    file: manual/modules/ROOT/pages/great_circle_sailing.adoc
    source: https://github.com/rgleason/route_pi (refname: master, start path: manual)
[14:05:41.162] ERROR (asciidoctor): target of xref not found: aisradar:ROOT:index.adoc
    file: manual/plugins/modules/ROOT/nav.adoc
    source: https://github.com/opencpn-manuals/plugins (refname: main, start path: manual/plugins)
[14:05:41.175] ERROR (asciidoctor): target of xref not found: aisradar:ROOT:index.adoc
    file: manual/plugins/modules/ROOT/nav.adoc
    source: https://github.com/opencpn-manuals/plugins (refname: main, start path: manual/plugins)
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