docs: add subsection on change of key fingerprints

• Document the warning "REMOTE IDENTIFICATION HAS CHANGED"
• Document implications and guidelines
• Resolve #673 (closed)

added Content Refinement label

requested review from @keba189g-at-tu-dresden.de

assigned to @mflehmig--tu-dresden.de

added 1 commit

• 50898d20 - docs: export nodes are gone; refer to dataport nodes

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mentioned in commit 61dfe395