Update app/docs/components.tsx

Co-authored-by: Tomas Carnecky <tomc@caurea.org>

Author: ptbrowne

app/docs/components.tsx

@@ -1,7 +1,7 @@
 import { markdown } from "catalog";
 
 const Doc = () => markdown`
-> The components used in the User Interface are built upon [rebass](https://mui.com/), a library of React UI components.
+> The components used in the User Interface are built upon [Material-UI](https://mui.com/), a library of React UI components.
 
 > All styles are defined in a \`theme\` file [that can be customized to a specific brand](/theming).