docs(api): add <NuxtWelcome /> component docs

docs/content/3.api/2.components/6-nuxt-welcome.md

@@ -0,0 +1,10 @@
+# `<NuxtWelcome>`
+
+::alert{type=info icon=🔎}
+This component is part of [@nuxt/ui](https://github.com/nuxt/ui)
+::
+
+Nuxt uses the `<NuxtWelcome>` component to greet users in new projects made from the starter template. It includes links to the Nuxt documentation, source code, and social media accounts.
+
+::ReadMore{link="https://github.com/nuxt/ui" title="@nuxt/ui"}
+::