Enhance data integration and transcript parsing

- Improved date parsing in fetch_and_store_chat_data to support multiple formats and added error logging for unparseable dates.
- Enhanced parse_and_store_transcript_messages to handle empty transcripts and expanded message pattern recognition for both User and Assistant.
- Implemented intelligent splitting of transcripts based on detected patterns and timestamps, with fallback mechanisms for unrecognized formats.
- Updated documentation for Celery and Redis setup, troubleshooting, and project structure.
- Added markdown linting configuration and scripts for code formatting.
- Updated Nginx configuration to change the web server port.
- Added xlsxwriter dependency for Excel file handling in project requirements.

.markdownlint.json

@@ -0,0 +1,17 @@
+{
+    "default": true,
+    "MD007": {
+        "indent": 4,
+        "start_indented": false,
+        "start_indent": 4
+    },
+    "MD013": false,
+    "MD029": false,
+    "MD030": {
+        "ul_single": 3,
+        "ol_single": 2,
+        "ul_multi": 3,
+        "ol_multi": 2
+    },
+    "MD033": false
+}