Add custom CSS (#264)

app/javascript/containers/AppearanceSiteSettings.tsx

@@ -0,0 +1,29 @@
+import { connect } from "react-redux";
+
+import AppearanceSiteSettingsP from "../components/SiteSettings/Appearance/AppearanceSiteSettingsP";
+import { updateTenant } from "../actions/Tenant/updateTenant";
+import { State } from "../reducers/rootReducer";
+
+const mapStateToProps = (state: State) => ({
+  areUpdating: state.siteSettings.appearance.areUpdating,
+  error: state.siteSettings.appearance.error,
+});
+
+const mapDispatchToProps = (dispatch: any) => ({
+  updateTenant(
+    customCss: string,
+    authenticityToken: string,
+  ): Promise<any> {
+    return dispatch(updateTenant({
+      tenantSetting: {
+        custom_css: customCss,
+      },
+      authenticityToken,
+    }));
+  },
+});
+
+export default connect(
+  mapStateToProps,
+  mapDispatchToProps
+)(AppearanceSiteSettingsP);