Refactor login page (#31530)

As requested in
https://github.com/go-gitea/gitea/pull/31504#issuecomment-2196196646.
This PR refactor the login page:

![Screenshot from 2024-07-04
19-23-10](https://github.com/go-gitea/gitea/assets/6918444/c45700f4-6747-473c-bdee-2156718a7953)

![Screenshot from 2024-07-04
19-23-21](https://github.com/go-gitea/gitea/assets/6918444/b1bf71cf-85f9-4517-a409-cc6d72e6af8f)

![Screenshot from 2024-06-30
09-35-20](https://github.com/go-gitea/gitea/assets/6918444/728cc37e-0cca-4883-afec-a43663d2c666)


# Changes
- [x] use separate box for passkey login and go to registration
- [x] move forgot passoword next to password label
- [x] fix password required label `*` and padding 
- [x] remove tabs from login page

---------

Co-authored-by: silverwind <me@silverwind.io>

templates/user/auth/oauth_container.tmpl

@@ -0,0 +1,29 @@
+{{if or .OAuth2Providers .EnableOpenIDSignIn}}
+<div class="divider divider-text">
+	{{ctx.Locale.Tr "sign_in_or"}}
+</div>
+<div id="oauth2-login-navigator" class="tw-py-1">
+	<div class="tw-flex tw-flex-col tw-justify-center">
+		<div id="oauth2-login-navigator-inner" class="tw-flex tw-flex-col tw-flex-wrap tw-items-center tw-gap-2">
+			{{range $provider := .OAuth2Providers}}
+				<a class="{{$provider.Name}} ui button tw-flex tw-items-center tw-justify-center tw-py-2 tw-w-full oauth-login-link" href="{{AppSubUrl}}/user/oauth2/{{$provider.DisplayName}}">
+					{{$provider.IconHTML 28}}
+					{{ctx.Locale.Tr "sign_in_with_provider" $provider.DisplayName}}
+				</a>
+			{{end}}
+			{{if .EnableOpenIDSignIn}}
+				<a class="openid ui button tw-flex tw-items-center tw-justify-center tw-py-2 tw-w-full" href="{{AppSubUrl}}/user/login/openid">
+				{{svg "fontawesome-openid" 28 "tw-mr-2"}}
+				{{ctx.Locale.Tr "sign_in_with_provider" "OpenID"}}
+				</a>
+			{{end}}
+			{{if .EnableSSPI}}
+				<a class="ui button tw-flex tw-items-center tw-justify-center tw-py-2 tw-w-full" rel="nofollow" href="{{AppSubUrl}}/user/login?auth_with_sspi=1">
+					{{svg "fontawesome-windows"}}
+					&nbsp;SSPI
+				</a>
+			{{end}}
+		</div>
+	</div>
+</div>
+{{end}}