SIP-32: Moving frontend code to the base of the repo (#9098)

* move assets out, get webpack dev working

* update docs to reference superset-frontend

* draw the rest of the owl

* fix docs

* fix webpack script

* rats

* correct docs

* fix tox dox

superset-frontend/src/explore/components/ControlRow.jsx

@@ -0,0 +1,42 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import React from 'react';
+import PropTypes from 'prop-types';
+
+const NUM_COLUMNS = 12;
+
+const propTypes = {
+  controls: PropTypes.arrayOf(PropTypes.object).isRequired,
+};
+
+function ControlSetRow(props) {
+  const colSize = NUM_COLUMNS / props.controls.length;
+  return (
+    <div className="row space-1">
+      {props.controls.map((control, i) => (
+        <div className={`col-lg-${colSize} col-xs-12`} key={i}>
+          {control}
+        </div>
+      ))}
+    </div>
+  );
+}
+
+ControlSetRow.propTypes = propTypes;
+export default ControlSetRow;