SHS - adding doc on db access

[2bPro]

EIDF Documentation Pull Request

Description

Please include a summary of the change and any issues being addressed.
Added a guide on how to access data via databases in Safe Havens.

Please also include relevant motivation and context.
Avoiding the circulation of an outdated Word document guide and collating SH user guides in one location.

List any dependencies that are required for this change.
None

Fixes # (issue)
None

Type of change

Please delete options that are not relevant.

• Incorrect Documentation
• Incomplete Documentation
• Missing Documentation
• Formatting
• New Documentation

What has to be reviewed

List the pages/sections that are to be reviewed.
Accessing Databases

Checklist

• Documentation follows the project style guidelines
• Ensure Contact details contain Service Emails and Numbers
• Self-review of documentation using mkdocs on local system
• Spellcheck has been performed
• Pre-commit has been run and passed