feat: use React.lazy for loading components (#158)

src/utils/asyncComponent.tsx

@@ -1,34 +0,0 @@
-import React, { ComponentClass } from 'react';
-
-export function asyncComponent(getComponent): ComponentClass {
-  return class AsyncComponent extends React.Component {
-    public static Component = null;
-    public state = { Component: AsyncComponent.Component };
-
-    public componentDidMount(): void {
-      const { Component } = this.state;
-      if (!Component) {
-        getComponent()
-          .then(({ default: Component }) => {
-            AsyncComponent.Component = Component;
-            /* eslint react/no-did-mount-set-state:0 */
-            this.setState({ Component });
-          })
-          .catch(err => {
-            console.error(err);
-          });
-      }
-    }
-
-    public render(): JSX.Element | null {
-      const { Component } = this.state;
-      if (Component) {
-        // eslint-disable-next-line verdaccio/jsx-spread
-        // @ts-ignore
-        return <Component {...this.props} />;
-      }
-
-      return null;
-    }
-  };
-}