feat(site): add forgot password link (#15108)

Demo:

https://github.com/user-attachments/assets/139eb8c0-5bd6-4bbd-8064-a4acc526afda

coderd/database/migrations/000266_update_forgot_password_notification.up.sql

@@ -0,0 +1,10 @@
+UPDATE notification_templates
+SET
+    title_template = E'Reset your password for Coder',
+    body_template = E'Hi {{.UserName}},\n\nUse the link below to reset your password.\n\nIf you did not make this request, you can ignore this message.',
+    actions = '[{
+		"label": "Reset password",
+		"url": "{{ base_url }}/reset-password/change?otp={{.Labels.one_time_passcode}}&email={{ .UserEmail }}"
+	}]'::jsonb
+WHERE
+    id = '62f86a30-2330-4b61-a26d-311ff3b608cf'