Add Starsheet headless CMS

src/site/headless-cms/starsheet.md

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+---
+title: Starsheet
+homepage: https://www.starsheet.app
+opensource: "No"
+typeofcms: "API Driven"
+supportedgenerators:
+  - All
+description: The Contentful® Composable Content Platform brings the building blocks of content together to create once and reuse for any digital experience. The API-first platform integrates easily with data sources and new functionality as digital experiences and technology evolve.
+---
+# Starsheet
+
+<img src="/img/cms/starsheet-hero.png" alt="Starsheet Screenshot" />
+
+Use Google Sheets as a low-cost, headless CMS, with zero infrastructure to manage but published to your AWS account so you're in complete control of your data.
+
+## Features
+
+<img src="/img/cms/starsheet-screenshot.png" alt="Starsheet dashboard screenshot" />
+
+- **Edit using Google Sheets** - Use a familiar editor that's flexible enough to evolve with your project. Need a new field? Simply add a column to the spreadsheet.
+- **Published to your AWS account** - You're in control of your data, removing the risk of a 3rd party service shutting down and impacting your app.  
+- **No infrastructure to manage** - Starsheet can set up everything automatically on your AWS account, and there's nothing that requires ongoing maintenance.
+- **Handles images + structured data** - Build complex data structures including objects and arrays and images from the spreadsheet are automatically published along with the data
+- **Environments + Version Control** - Starsheet creates a robust publishing workflow that allows you to iterate and test in isolation from your live project, with full history and rollbacks.
+- **Extremely low hosting costs** - Startsheet doesn't charge or restrict plans based on usage. You pay AWS data transfer costs directly so there's no markup and you can take advantage of AWS free usage allowances.
+
+## Sample Project
+
+View a [sample project](https://web.samples.starsheet.app/grid) which uses Starsheet to publish a online conference schedule with no backend and a few lines of Javascript.
+
+<img src="/img/cms/starsheet-sample-project.png" alt="Sample project screenshot" />