Migrate install instructions away from curl ... | bash type script

[dotboris]

Related to #42 & #41

[dotboris]

@binaryannie You mentioned that you were down to help review / test this. If you're still down to help out, I'd appreciate it a whole lot.

I'm not quite sure if you're going to be able to start a review yourself tho. Let me know if there are issues.

[dotboris]

I tested with Ubuntu in docker. Everything works fine except two things:

1. The comment I left above about apt install ./...
2. zsh on doesn't source /etc/profile on ubuntu. This should not be a big issue since users will be directed to the troubleshooting section and will solve their issue in the end.

[dotboris]

I've tested the pre-packaged binary install on alpine in docker. Everything worked but I got a few quirks:

1. bash_completion is installed in /usr/share/bash-completion/completions/ so I've had to tweak the path. This is fine because the instructions state that you may need to fix up paths.

[dotboris]

Tested install from source on alpine. Didn't work at all. Can't install rust from rustup.rs on alpine. They don't have a musl based version of rustup-init.

After that I tested with debian. Worked fine. Got the following quirks

1. /etc/bash_completion.d didn't exist so I had to create it myself. This turns out is what I could have done with the prepackaged binary install. I don't think that it's a problem since we expect users to adapt the path, plus it should exist on systems with a bunch of completions already installed
2. zsh didn't source /etc/profile. This is the same as before. Should be fine.

[binaryannie]

@dotboris I see in #42 that you stated

There's no easy / official uninstall method

Is there a way now? Should it be documented here?

EDIT: darn, did not want to end the review here...

[dotboris]

@binaryannie about the uninstall instructions, that's a good question.

For homebrew, linuxbrew & deb, I don't think that there's a point as they have standard uninstall methods and I think that it's fair to consider that users know how to user them or can figure that out.

As for the manual installations, I think that it could be useful. I would kick off another PR for that as this PR can stand on its own without uninstall instructions.

[binaryannie]

@dotboris I have a hard time testing the install instructions because I already have alt installed and don't know how to uninstall it properly, haha!

[dotboris]

@binaryannie I assume that you have installed alt with the "old" curl ... | bash method. To uninstall alt all you need to do is remove /usr/local/bin/alt.

[dotboris]

TODO: add to changelog