docs: phone authentication + otp guide (#12544)

* initial

* docs: phone authentication guide

* small fix

* Twilio SMS -> Twilio

* vale fix

* fix

* fix to auth sidebar

* fixes

* generate

www/apps/resources/sidebars/auth.mjs

@@ -47,7 +47,7 @@ export const authSidebar = [
       {
         type: "category",
         title: "Server Guides",
-        autogenerate_tags: "server+auth",
+        autogenerate_tags: "auth+server",
         autogenerate_as_ref: true,
         sort_sidebar: "alphabetize",
         description: