[openstreetmap/openstreetmap-website] Yarn install broken - INSTALL.md out of date? (Issue #3579)

[jmcb]

I followed the instructions in INSTALL.md with a fresh virtualbox of ubuntu server 20.04. In the yarn step I get this result:
```
user at hostname:~/openstreetmap-website$ bundle exec rake yarn:install
/usr/lib/ruby/2.7.0/net/protocol.rb:66: warning: already initialized constant Net::ProtocRetryError
/var/lib/gems/2.7.0/gems/net-protocol-0.1.3/lib/net/protocol.rb:68: warning: previous definition of ProtocRetryError was here
/usr/lib/ruby/2.7.0/net/protocol.rb:206: warning: already initialized constant Net::BufferedIO::BUFSIZE
/var/lib/gems/2.7.0/gems/net-protocol-0.1.3/lib/net/protocol.rb:208: warning: previous definition of BUFSIZE was here
/usr/lib/ruby/2.7.0/net/protocol.rb:503: warning: already initialized constant Net::NetPrivate::Socket
/var/lib/gems/2.7.0/gems/net-protocol-0.1.3/lib/net/protocol.rb:504: warning: previous definition of Socket was here
yarn install failed to execute.
Ensure yarn is installed and `yarn --version` runs without errors.
user at hostname:~/openstreetmap-website$
```
I also found this line in the dockerfile that says this is expected to not work. Seems the INSTALL.md needs updating to match the Dockerfile.
https://github.com/openstreetmap/openstreetmap-website/blob/master/Dockerfile#L47

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