Incomplete install instructions for users unfamiliar with Haskell ecosystem

[stain]

I was unable to install morloc following the README, as if you use apt install haskell-stack in Linux Mint 21.3 you get an error about ghc-tinfo6 after stack install --fast

It turns out I needed to use a newer version of stack from get.haskellstack.

As you have a Docker image arendsee/morloc:v0.48.0 it may be useful to hint at this in the README as an alternative to a complex build operation.

It is unclear which operating systems and distributions are supported by morloc.

[arendsee]

@stain Having users build morloc from source is kind of mean, actually. I'll add a link to the Docker image. Though eventually I should distribute binaries, users shouldn't need to install a whole Haskell environment to use morloc. And I should add it to conda and aur and similar package managers.

I'll leave this issue open until I provide a good installation option.

[arendsee]

@stain I've updated the instructions with a Docker-based solution.