feat: Add sections corresponding to new SMS UI functionality in dashboard

[yourtallness]

[!IMPORTANT] 🔎 Previews:

• https://clerk.com/docs/pr/1244/authentication/configuration/email-sms-templates
• https://clerk.com/docs/pr/1244/authentication/configuration/sign-up-sign-in-options

This includes:

• SMS allowlist
• SMS template enabled status toggle
• SMS template approval flow

This PR:

https://clerk.com/docs/pr/1244/authentication/configuration/email-sms-templates

• Removes unnecessary info, including lists of templates (as these can become outdated and are hard to maintain)
• Reorganizes the email-sms-templates page. Settings that were available to both Email and SMS templates are now only available to Email templates, so these sections were moved under #edit-email-templates and the sections were abstracted into bullet points. Also, missing UI information was added such as the From, Reply-To, and Subject settings. For #edit-sms-templates, the copy was updated to reflect the new UI. Sections were abstracted into bullet points wherever they could be, and the new Request change feature was added.

https://clerk.com/docs/pr/1244/authentication/configuration/sign-up-sign-in-options

• Documents new information about the SMS allowlist

[github-actions[bot]]

Hey, here’s your docs preview: https://clerk.com/docs/pr/1244