docs: add comprehensive troubleshooting guide

- Introduce a new troubleshooting guide to address common issues
- Cover installation, SQL syntax, file access, and S3 authentication errors
- Include solutions for type conversion, memory, and performance issues
- Provide guidance on interactive shell and backend selection problems
- Update mkdocs.yml to include the troubleshooting guide in navigation

This guide aims to assist users in diagnosing and resolving frequent problems, enhancing the overall user experience and reducing support requests.

Author: subhayu99