Show contact links - point to ./contact

Now that we have a contact page thanks to #139, I believe it would be logical to point the Show pages to have the "Contact" link point to `https://jupiterbroadcasting.net/contact/` instead of, say, `https://coder.show/contact`

it would mean:
* losing the functionality of having the show be auto-chosen for feedback (listeners would have to explicitly choose say Coder Radio from the dropdown menu)
* improved UX: not having listeners be taken away from the main JB site

I believe that's an acceptable compromise. Thoughts? Open to feedback, as always.