Documentation Update: 0.6.20

[sg-doc-holiday]

Documentation corrections

• Adds detailed instructions on creating and configuring charts and dashboards in the OpenOps Analytics view
• Documents how to create virtual datasets using SQL queries within the Analytics admin portal
• Provides step-by-step guidance for connecting OpenOps Analytics to external data sources such as CSV files and Google Sheets
• Includes best practices and troubleshooting tips for virtual datasets
• Enhances the Analytics guide with images and clear navigation instructions for the Analytics admin portal
• Clarifies prerequisites and requirements for creating virtual datasets
• Expands troubleshooting advice for virtual dataset creation errors
• Provides detailed step-by-step instructions for connecting and uploading data to external data sources like Postgres and Google Sheets within the Analytics portal

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This was opened from: https://github.com/openops-cloud/openops/releases/tag/untagged-fe439b8060138b1fb3bf

The publication for this is: Documentation