Show OpenID Connect and OAuth on signup page (#20242)

Fix #19809

---------

Signed-off-by: Dmitry Sharshakov <d3dx12.xx@gmail.com>
Co-authored-by: jackHay22 <jack@allspice.io>

templates/user/auth/signin_navbar.tmpl

@@ -4,6 +4,9 @@
 		<a class="{{if .PageIsLogin}}active {{end}}item" rel="nofollow" href="{{AppSubUrl}}/user/login">
 			{{.locale.Tr "auth.login_userpass"}}
 		</a>
+		<a class="{{if .PageIsSignUp}}active{{end}} item" rel="nofollow" href="{{AppSubUrl}}/user/sign_up">
+			{{.locale.Tr "auth.create_new_account"}}
+		</a>
 		{{if .EnableOpenIDSignIn}}
 		<a class="{{if .PageIsLoginOpenID}}active {{end}}item" rel="nofollow" href="{{AppSubUrl}}/user/login/openid">
 			{{svg "fontawesome-openid"}}

templates/user/auth/signup.tmpl

@@ -1,5 +1,6 @@
 {{template "base/head" .}}
 <div role="main" aria-label="{{.Title}}" class="page-content user signin{{if .LinkAccountMode}} icon{{end}}">
+	{{template "user/auth/signin_navbar" .}}
 	<div class="ui middle very relaxed page grid">
 		{{template "user/auth/signup_inner" .}}
 	</div>

templates/user/auth/signup_inner.tmpl

@@ -55,6 +55,25 @@
 				</div>
 				{{end}}
 			{{end}}
+
+			{{if and .OrderedOAuth2Names .OAuth2Providers}}
+			<div class="divider divider-text">
+				{{.locale.Tr "sign_in_or"}}
+			</div>
+			<div id="oauth2-login-navigator" class="gt-py-2">
+				<div class="gt-df gt-fc gt-jc">
+					<div id="oauth2-login-navigator-inner" class="gt-df gt-fc gt-fw gt-ac gt-gap-3">
+						{{range $key := .OrderedOAuth2Names}}
+							{{$provider := index $.OAuth2Providers $key}}
+							<a class="{{$provider.Name}} ui button gt-df gt-ac gt-jc gt-py-3 oauth-login-link" href="{{AppSubUrl}}/user/oauth2/{{$key}}">
+								{{$provider.IconHTML}}
+								{{$.locale.Tr "sign_in_with_provider" $provider.DisplayName}}
+							</a>
+						{{end}}
+					</div>
+				</div>
+			</div>
+			{{end}}
 		</form>
 	</div>
 </div>