Documentation ReST fails to build due to errors and a warning

[oliverklee]

https://github.com/in2code-de/femanager/actions/runs/16593794870/job/46935534494?pr=656

[2025-07-29T10:40:51.016940+00:00] app.ERROR: Error while processing "include" directive in "Features/ConfirmUserConfirmationRefused/Index": Include "../../Includes.txt" (/Features/ConfirmUserConfirmationRefused/../../Includes.txt) does not exist or is not readable. {"rst-file":"Features/ConfirmUserConfirmationRefused/Index.rst","currentLineNumber":2,"currentLine":""} []
[2025-07-29T10:40:51.086731+00:00] app.ERROR: Error while processing "include" directive in "Features/ShowListUsers/Index": Include "Images.txt" (/Features/ShowListUsers/Images.txt) does not exist or is not readable. {"rst-file":"Features/ShowListUsers/Index.rst","currentLineNumber":2,"currentLine":""} []
[2025-07-29T10:40:51.142138+00:00] app.WARNING: Only field lists are allowed in each list item a t3-field list. Node of type phpDocumentor\Guides\Nodes\ListNode found. {"rst-file":"Installation/Index.rst","currentLineNumber":2225} []

[sbusemann]

Rework of the documentation is in progress