Add docker setup and use instructions

[dkrautha]

Also removed lots of (what I think is now) unnecessary info from the readme, if I've gone overboard feel free to revert some of that

[ahuston-0]

Hey @dkrautha does this still need review or is it pending some work still. Could take a look later if you'd like

[dkrautha]

It's tested and working on linux, but there's a couple more changes that need to happen to this branch:

1. Add a GRAIL env var and add $GRAIL/bin to the path because professor kruger asked for it
2. Almost certainly revert a bunch of the changes to the readme as some are already incorporated in the main branch, and a lot of the windows instructions shouldn't be kept if the docker container isn't working on windows (opening a gui didn't work, but compiling did)
3. If anybody does seriously want to use docker for development, it should be made clear that their editor experience will likely be subpar if they don't install and configure the editor in the container itself.
4. Possibly just remove the custom container instructions and just include distrobox instructions, as then theoretically all that should need to be done is installing the editor in the container, and it'd pick up on all the configuration stuff in the user's home directory automatically