feat: use system color theme

frontend/src/components/navBar/ActionAvatar.tsx

@@ -1,8 +1,7 @@
 import { ActionIcon, Avatar, Menu } from "@mantine/core";
 import { NextLink } from "@mantine/next";
-import { DoorExit, Link, Moon } from "tabler-icons-react";
+import { DoorExit, Link } from "tabler-icons-react";
 import authService from "../../services/auth.service";
-import ToggleThemeButton from "./ToggleThemeButton";
 
 const ActionAvatar = () => {
   return (
@@ -13,13 +12,12 @@ const ActionAvatar = () => {
         </ActionIcon>
       </Menu.Target>
       <Menu.Dropdown>
-        <Menu.Label>My account</Menu.Label>
         <Menu.Item
           component={NextLink}
           href="/account/shares"
           icon={<Link size={14} />}
         >
-          Shares
+          My shares
         </Menu.Item>
         <Menu.Item
           onClick={async () => {
@@ -29,10 +27,6 @@ const ActionAvatar = () => {
         >
           Sign out
         </Menu.Item>
-        <Menu.Label>Settings</Menu.Label>
-        <Menu.Item icon={<Moon size={14} />}>
-          <ToggleThemeButton />
-        </Menu.Item>
       </Menu.Dropdown>
     </Menu>
   );