feat(auth): implement user authentication system

backend/node_modules/istanbul-reports/lib/html-spa/src/flattenToggle.js

@@ -0,0 +1,25 @@
+const React = require('react');
+
+module.exports = function FlattenButton({ setIsFlat, isFlat }) {
+    return (
+        <div className="toggle">
+            <div className="toggle__label">Files:</div>
+            <div className="toggle__options">
+                <button
+                    onClick={() => setIsFlat(!isFlat)}
+                    className={
+                        'toggle__option ' + (!isFlat ? 'is-toggled' : '')
+                    }
+                >
+                    Tree
+                </button>
+                <button
+                    onClick={() => setIsFlat(!isFlat)}
+                    className={'toggle__option ' + (isFlat ? 'is-toggled' : '')}
+                >
+                    Flat
+                </button>
+            </div>{' '}
+        </div>
+    );
+};