Resolve "Rename introductory guides"

This MR updates the documentation to address #190 (closed).

Can this MR be accepted?

• Documentation extended or updated
  • Renamed guides
  • Renamed examples.rst to usage.rst
• No code changes (except tested includes)

• Ready for merging
  • Pipeline passes without warnings
  • History cleaned-up or squash option set
  • Changelog entry added
  • Version number bumped

Related issues

Closes #190 (closed)