Update README.md with unified prod build status badge

README.md

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 # 🌲🌳 dbtree 🚃🌉
-[![Scrape latest data](https://github.com/gwenwindflower/dbtree/actions/workflows/update.yml/badge.svg)](https://github.com/gwenwindflower/dbtree/actions/workflows/update.yml)
-[![Load data into MotherDuck](https://github.com/gwenwindflower/dbtree/actions/workflows/build.yml/badge.svg)](https://github.com/gwenwindflower/dbtree/actions/workflows/build.yml)
+[![Refresh data](https://github.com/gwenwindflower/dbtree/actions/workflows/update.yml/badge.svg)](https://github.com/gwenwindflower/dbtree/actions/workflows/update.yml)
 [![Netlify Status](https://api.netlify.com/api/v1/badges/5e781b47-3433-4cc7-b2a1-4ad9712e5da8/deploy-status)](https://app.netlify.com/sites/dbtree/deploys)
 
 > This project is forked from the great [Simon Willison](https://github.com/simonw)'s git scraping project [sf-tree-history](https://github.com/simonw/sf-tree-history). The original project is a demonstration of how to use GitHub Actions to run a Python script that scrapes data from a website and commits the data to the repository, using Simon's `csv-diff` project to generate human readable commits on changes to the data. Git itself then acts as a versioned database for the data.