Restructure - Consolidate troubleshooting section navigation

[rajlearner17]

Guide purpose
A clear and concise description of what the guide aims to achieve and why it's important.

Following activities

• /guardrails/docs/guides/troubleshooting will have consolidated index.md page to contain respective troubleshooting guides for Hosting Guardrails and Using Guardrails
• Move the current guides under /guardrails/docs/guides/troubleshooting to /guardrails/docs/guides/hosting-guardrails/troubleshooting

Target audience
Specify who this guide is intended for (e.g., beginners, advanced users, specific roles).

Categories
Proposed primary category and categories where this guide would fit best. (e.g., Getting Started, Best Practices, Troubleshooting, Concepts etc).

Outline
A brief outline of the main sections or topics the guide will cover.