feat: Custom accent color (#4897)

* types

* Working, but messy

* Add InputColor component

* types

* Show default theme values when not customized

* Support custom theme on team sign-in page

* Payload validation

* Custom theme on shared documents

* Improve theme validation

* Team -> Workspace in settings

app/components/LoadingIndicator/LoadingIndicatorBar.tsx

@@ -28,7 +28,7 @@ const Container = styled.div`
 const Loader = styled.div`
   width: 100%;
   height: 2px;
-  background-color: ${(props) => props.theme.primary};
+  background-color: ${(props) => props.theme.accent};
 `;
 
 export default LoadingIndicatorBar;