(doc): update sight README
Description
Well, the main README.md is not really up-to-date...
Functional specifications
- Update software requirements
- Update all screenshots
I would also propose to no longer advertise dicomXplorer since it should be removed at some point...
Technical specifications
- Do it and test it.
- We have cspell directives that appears when the text is rendered, we should try to fix that
- We need a MR for sight-doc since it hosts the screenshots
Test plan
- Just watch how the text is rendered in GitLab