refactor(storybook): alphabetize addons.

Co-authored-by: John Leider <9064066+johnleider@users.noreply.github.com>

Author: ElijahKotyluk

packages/@vuetify/storybook/generator/template/_storybook/main.js

@@ -1,11 +1,11 @@
 module.exports = {
   stories: ['./stories/**/*.stories.js'],
   addons: [
-    '@storybook/addon-knobs/register',
-    '@storybook/addon-actions/register',
-    '@storybook/addon-viewport/register',
-    '@storybook/addon-a11y/register',
-    '@storybook/addon-docs/register',
-    './addon-show-vue-markup/register',
+  '@storybook/addon-a11y/register',
+  '@storybook/addon-actions/register',
+  '@storybook/addon-docs/register',
+  '@storybook/addon-viewport/register',
+  '@storybook/addon-knobs/register',
+  './addon-show-vue-markup/register',
   ],
-}
+}