Use of sh:count

[tgra]

Through curation of shapes from SolidOS repositories for https://github.com/solid/shape-generation-artefacts:

• sh:count 1; was found in https://github.com/SolidOS/chat-pane/blob/main/shapes/chat-shapes.ttl
• sh:count is not part of https://www.w3.org/TR/shacl/
• Replace with:
  sh:minCount 1; sh:maxCount 1;

Original issue: solid/shape-generation-artefacts#6