A selection of small usability improvements

• "Select a profile"
  • How to proceed? Press Enter to proceed (probably in copier itself)
• "Select code quality features"
  • <a> to toggle toggle what? It should probably be <a> to toggle all (probably in copier itself)
  • How to proceed? Press Enter to proceed (probably in copier itself)
• .gitignore
  • change .swp to *.swp
  • more entries are probably needed, check https://github.com/github/gitignore/blob/main/Python.gitignore for inspiration
• next_steps.md
  • git remote add origin git@github.com:/test_package is missing the org? (validation step needed)
  • Same for "Check automatically generated issues"
  • "Push the initial commit to a new repo on GitHub"
    • Links have double //
• project_setup.md
  • Lots of unnecessary whitespace/newlines
  • "Package version number"
    • The package version is not in a single place (pyproject.toml), it is also present in src/test_package/__init__.py Is this both bumped? Needs quick testing.
  • MANIFEST.in and NOTICE could use more context, what is it good for?
• NOTICE has no contributors (validation step needed)
• README.md
  • Has no title / h1 header
  • Extra empty lines
• "What is the email address cor code of conduct?" (typo and double-space)
• Not selecting "docs" or "github actions" still creates all the folders (apparently not implemented yet)
• Validation step needed for empty "full name"
• Are more than two keywords allowed? keyword1, keyword2