Add oneboxing for deep links

Following up from Add a way to link to a question in the app maybe if you include a link, it could generate a onebox to the app.

That isn’t super important on the forum, but it might be an interesting way to bring people into the app from other places like reddit and facebook — making it easy for users to talk about the questions on other forums in a way that invites new users into the site.

going to start building this now that I have fixed the cache miss problem

Testing this:

https://app.openhamprep.com/questions/E9B01

Looks like it’s still returning a 429?

Finally
@mcdanlj disoucrce needs to update there docs or even just as a simple text of what the exact user agent is they use. Took forever to figure that out for the firewall.