Single file article prompt

[stunningpixels]

This creates a separate prompt for article explanation when there is only one file in the context. As the code is shown next to the explanation we do not need the ability to quote code.

Concerns and mitigations:

• If conversation starts with one file in context, and follow up includes multiple files, are future explanations bias towards single file explanation format because of conversation history?
  • A: yes, future explanations after a single file explanation will feature fewer quoted blocks of code, but if the user explicitly asks for code it is able to quote code
• What if the user's query should be answered by generating new code?
  • The explanation generates new code in md format, I haven't noticed any issues
• Summary has been purposefully omitted from single file explanation, I don't think it makes sense in this case