feat: Add support for dark mode in dashboard (#7460)

- Add config for TailwindCSS
- Enable HMR
- Add a config in LocalStorage for Dark Mode

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

app/javascript/dashboard/components/layout/sidebarComponents/OptionsMenu.vue

@@ -7,7 +7,6 @@
       :class="{ 'dropdown-pane--open': show }"
     >
       <availability-status />
-      <li class="divider" />
       <woot-dropdown-menu>
         <woot-dropdown-item v-if="showChangeAccountOption">
           <woot-button