Remove references of https://acplt.org/ from example data

[s-heppner]

In some of the example files, we use https://acplt.org/ as identifier base name.
Since this is outdated, we should remove these references and replace them with something more appropriate, for example https://example.org/.

[ArokyaMatthew]

@s-heppner , I am would like to work in this , could you assign this to me?