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/controls/SliderControl.jsx

@@ -0,0 +1,50 @@
+/**
+ * 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';
+
+import BootstrapSliderWrapper from '../../../components/BootstrapSliderWrapper';
+import ControlHeader from '../ControlHeader';
+
+const propTypes = {
+  onChange: PropTypes.func,
+  value: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
+};
+
+const defaultProps = {
+  onChange: () => {},
+};
+
+export default function SliderControl(props) {
+  // This wouldn't be necessary but might as well
+  return (
+    <div>
+      <ControlHeader {...props} />
+      <BootstrapSliderWrapper
+        {...props}
+        change={obj => {
+          props.onChange(obj.target.value);
+        }}
+      />
+    </div>
+  );
+}
+
+SliderControl.propTypes = propTypes;
+SliderControl.defaultProps = defaultProps;