[Feature]: Improve compose file

[oregonpillow]

Closes #145

open to suggestions

[oregonpillow]

make the compose file "self-describing" and following standard compose practices:

• explicitly set / describe all environment variables within compose
• include commented options when settings are optional (e.g usb pass through)
• comments to improve readability
• mounting persistent data next to compose file

[kroese]

Thanks for your efforts, but I'd rather keep it the way it is. To start off, those values suggested for cpu/ram/disk are different from the current default values. Also, there are many many more variables that can be set, about 30 of them and if we would include them all, it would become a huge compose file.

So it was a very deliberate decision to keep the example compose file reduced to the absolute minimum and as short as possible, so that people do not get overwhelmed by it.