Incorrect instructions for installing from scratch

[ctsrc]

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• Is this only a single bug? Do not put multiple bugs in one issue.
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Issue Summary

Documentation https://join-lemmy.org/docs/en/administration/from_scratch.html has the following step

cargo install lemmy_server --target-dir /usr/bin/ --locked --features embed-pictrs

This does not put lemmy_server in /usr/bin/. What it does do is to put all of the build artifacts in /usr/bin which is not desired. And it still puts the final binary in $HOME/.cargo/bin/

Steps to Reproduce

Follow the steps in https://join-lemmy.org/docs/en/administration/from_scratch.html

Technical details

• Please post your log: sudo docker-compose logs > lemmy_log.out.
• What OS are you trying to install lemmy on?
• Any browser console errors?

[ctsrc]

Solution is to change the step into

cargo install lemmy_server --root /usr/ --locked --features embed-pictrs

https://stackoverflow.com/questions/43109558/how-do-i-change-where-cargo-install-places-binaries

[ctsrc]

Duplicate of LemmyNet/lemmy-docs#212