Implement llms.txt standard

[chriscarrollsmith]

• Maybe make some suggestions in docs/customization.qmd about how to feed the documentation to an LLM for the purpose of building on top of this template
  • Develop automated workflow to concatenate all documentation .qmd files into a single downloadable static text file, and then link to this file?
  • Develop example .cursorrules file for developing on this template?
• Implement this standard?: https://llmstxt.org/