Adjust image links

[jreineckearm]

Fixes

• #

Changes

• Adjust image links to those now available on main.
• Fix typos in README

Screenshots

Checklist

• 🤖 This change is covered by unit tests (if applicable).
• 🤹 Manual testing has been performed (if necessary).
• 🛡️ Security impacts have been considered (if relevant).
• 📖 Documentation updates are complete (if required).
• 🧠 Third-party dependencies and TPIP updated (if required).

[soumeh01]

@jreineckearm Linter findings are addressed under 1a24ee2

[jreineckearm]

And now also by af9e4ee