Add discord-link and cleanup README

[fflaten]

PR Summary

A little cleanup of README

• Updates a few broken links
• Adds a Discord-link under got questions
• Remove duplicate images
• Update logo URLs in nuspec and psd1
• Move Examples?

PR Checklist

• PR has meaningful title
• Summary describes changes
• PR is ready to be merged
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• Tests are added/update (if required)
• Documentation is updated/added (if required)

[fflaten]

• Remove duplicate images?
• Move Examples?

@nohwnd Any thoughts on the docs-folder in the repo? You placed examples and images subfolders in it during 5.0 dev, but later added the same images (mostly) to /images while updating the README.

Should I update README to use docs/images paths and merge/remove the /images on root? Or move examples to root and delete docs?

[nohwnd]

I guess I wanted to have docs in separate folder but then we created a whole new docs repo. I think images in root should stay.