Update upgrading and deployment docs
Copy the 0.12.1 release notes into main branch
Document need for Nginx `proxy_set_header Host` config [trac#5612]
MediaGoblin is a free software media publishing platform that anyone can run. You can think of it as a decentralized alternative to Flickr, YouTube, SoundCloud. It's also:
MediaGoblin is a self-hosted web application that you install on a server you or your organisation controls. See our Deploying MediaGoblin for instructions.
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