Updating screenshots of the plugin

[gabriel-glo]

Description of the Change

Updated screenshots for:

• podcast taxonomy setup
• editor view for the podcast block

Still need to add and incorporate screenshots from #264

Closes #213 #264

How to test the Change

Visible in Readme.md

Changelog Entry

Added - New screenshots in Readme.md

Credits

Props @username, ...

Checklist:

• [x] I agree to follow this project's Code of Conduct.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my change.
• [ ] All new and existing tests pass.

[jeffpaul]

@Sidsector9 as the latest helping out here, can you please help get this updated so its good to merge?