Does such a website exist?
You can include statistics, screenshots, fun facts… 
For every new Picard release you can read the changes at the MB blog:
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there is the Timeline graph for MusicBrainz stashed in the Statistics page: Database statistics - Timeline graph - MusicBrainz
that said, a more detailed history could be good to have~
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In stats - so when did Digital Media overtake CDs?
https://musicbrainz.org/statistics/formats
CDs are only still at the top position due to the higher count of separate mediums… but raw releases they have already been passed.
That would be an interesting graph to see over time. Is there any way to get more than one line on the graph at a time?
Excellent. Thanks @chaban. I can lay a few graphs on top of each other now.
It is interesting the way the CD line stays at a consistent angle whilst the Digital Media line accelerates.