Improve Dragonfly documentation

[johannest]

Dragonfly documentation is really thin
​
​https://vaadin.com/docs/latest/tools/modernization-toolkit/dragonfly
​
E.g. it does not say, do you need to add Vaadin 24 in your pom.xml yourself, or will the tool do it for you? At least following common steps should be documented:

• Run automation

• Check logs

• Modify dependencies to point to Flow

  • Exclude addons

• Add modernization classes

• Fix imports (Eclipse organize imports with appropriate exclusions)

• Check compiling errors and changelog

• See Eclipse error log, create pivot table (e.g. with Excel/Google Sheet) of most common errors and start fixing the compilation error from the most frequently occurring ones

• General best practices and pitfalls

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[bennewi]

that's done, guess this can be closed