- This is a very basic support. All it affects is the listings
on the homepage. Every conference can set a domain, and as
long as the request host matches this domain, the conference
will be shown on the list
- If a conference does not have a domain set (which will be the
case for older conferences), such conferences are shown
always
- Conference creation and edits now have an optional domain field
- Also adds corresponding migrations (+index)
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