feat: remove discord icon button

src/components/molecules/NavBar.tsx

@@ -71,21 +71,6 @@ export const NavBar: React.FC<NavBarProps> = ({ recordingName, isRecording }) =>
           <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'flex-end' }}>
             {!isRecording ? (
               <>
-                <IconButton
-                  component="a"
-                  href="https://discord.gg/5GbPjBUkws"
-                  target="_blank"
-                  rel="noopener noreferrer"
-                  sx={{
-                    display: 'flex',
-                    alignItems: 'center',
-                    borderRadius: '5px',
-                    padding: '8px',
-                    marginRight: '30px',
-                  }}
-                >
-                  <DiscordIcon sx={{ marginRight: '5px' }} />
-                </IconButton>
                 <iframe src="https://ghbtns.com/github-btn.html?user=getmaxun&repo=maxun&type=star&count=true&size=large" frameBorder="0" scrolling="0" width="170" height="30" title="GitHub"></iframe>
                 <IconButton onClick={handleMenuOpen} sx={{
                   display: 'flex',