refactor: remove tailscale oauth

frontend/src/components/auth/oauth-buttons.tsx

@@ -2,7 +2,6 @@ import { Grid, Button } from "@mantine/core";
 import { GithubIcon } from "../../icons/github";
 import { GoogleIcon } from "../../icons/google";
 import { OAuthIcon } from "../../icons/oauth";
-import { TailscaleIcon } from "../../icons/tailscale";
 
 interface OAuthButtonsProps {
   oauthProviders: string[];
@@ -41,19 +40,6 @@ export const OAuthButtons = (props: OAuthButtonsProps) => {
           </Button>
         </Grid.Col>
       )}
-      {oauthProviders.includes("tailscale") && (
-        <Grid.Col span="content">
-          <Button
-            radius="xl"
-            leftSection={<TailscaleIcon style={{ width: 14, height: 14 }} />}
-            variant="default"
-            onClick={() => mutate("tailscale")}
-            loading={isLoading}
-          >
-            Tailscale
-          </Button>
-        </Grid.Col>
-      )}
       {oauthProviders.includes("generic") && (
         <Grid.Col span="content">
           <Button