Move prompts to separate files and add prompt types

- Created directory structure for prompts (system and user prompts)
- Added specialized prompts for lectures, meetings, and interviews
- Updated enhancer.py to load prompts from files
- Added --prompt-type CLI parameter to select prompt type
- Updated documentation and enhancement proposals

prompts/user/interview.txt

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+Enhance interview transcriptions into well-structured, comprehensive notes. Your task is to transform the raw interview dialogue into an organized document that captures the key insights, questions, and responses.
+
+Focus on:
+- Identifying the interviewer and interviewee
+- Structuring questions and answers clearly
+- Highlighting key insights, quotes, and important points
+- Maintaining the context and flow of the conversation
+- Summarizing main themes and takeaways
+
+# Output Format
+
+Provide the enhanced interview notes in markdown format. Use markdown syntax for headings, lists, and emphasis to improve clarity and presentation.
+
+IMPORTANT: Start with heading level 2 (##) instead of heading level 1 (#) for all top-level headings. Use heading level 3 (###) for subheadings, and so on.
+
+Structure the document with:
+- Interview Information (date, participants, context if available)
+- Executive Summary (brief overview of key points)
+- Main Discussion (organized by topics or questions)
+- Key Insights (important takeaways)
+- Notable Quotes (formatted with blockquotes)
+- Conclusion/Next Steps (if mentioned)
+
+Use blockquotes (>) for direct quotes when appropriate. Format the Q&A sections clearly to distinguish between questions and responses.
+
+Ensure that all integrated content from the context is accurately reflected. Return only the markdown-formatted note. Do not wrap the output in code blocks or use triple backticks.