docs: simplify and streamline backup, recovery, and development guides

The documentation for backup and recovery has been simplified to focus on essential procedures, removing redundant and overly detailed sections. This change aims to make the guide more accessible and easier to follow for users who need to perform critical backup and recovery tasks without being overwhelmed by excessive information.

The development guide has been streamlined to focus on the core development workflow and local setup, removing sections that were either redundant or too detailed for the intended audience. This change helps new developers quickly understand the essential steps to get started with development on IRC.atl.chat.

These changes were made to improve the usability and clarity of the documentation, ensuring that users and developers can efficiently perform necessary tasks without unnecessary complexity.

docs: simplify and update secret management and troubleshooting guides

Simplify the Secret Management guide by removing redundant
sections and focusing on key practices. Emphasize the use of
environment variables and secure file permissions. Update
troubleshooting guide to streamline common issues and solutions,
removing excessive detail and focusing on actionable steps.

The changes aim to make the documentation more concise and
user-friendly, reducing complexity and improving readability.
This helps users quickly find relevant information and resolve
issues efficiently, enhancing overall user experience.

Author: kzndotsh