[FEAT] RSS Stream for the blog

[miggi92]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
I want a rss stream in for the blog like the nuxt.com stream.

Describe alternatives you've considered
none

Additional context
Button:
<UButton to="/blog/rss.xml" color="gray" external icon="i-ph-rss" size="2xs" target="_blank" > RSS </UButton>

PR of the nuxt.com repo: nuxt/nuxt.com#1431