Resolve "Execution: Renaming GUI Startpage"
Acceptance criteria
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Coverage is higher or equal to coverage on master 
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CI runs without problems -
Code doesn't contain TODOs or unused functions -
Code has been inspected and deemed to have decent quality [effectiveGo]: https://golang.org/doc/effective_go.html
Closes #188 (closed)
Edited by Matthias Gürtler