Convert site URLs during deployment

[AetherUnbound]

Currently in order to use the site, we have our "Sites" set to 2023.pycascades.com. This makes it so that all references throughout the site link to that base domain (e.g. /about -> 2023.pycascades.com/about).

The trouble with this setup is that it makes navigating on our staging site impossible to do with just clicking around, since each link on pycascades-cms.herokuapp.com goes to 2023.pycascades.com. We can't change the Site setting in wagtail to pycascades-cms.herokuapp.com though, because then when we deploy all of the links on 2023.pycascades.com would link back to heroku instead.

It would be ideal if we could set up the site to be pycasades-cms.herokuapp.com in Wagtail but during the netlify deployment step rewrite all of those links to 2023.pycascades.com. This way navigation on the staging site would be restored while ensuring all links on the prod deployed site reference production rather than staging.