Remove Docker context generator

[TadCordle]

Fixes #1219, since that's what the issue is about
Fixes #1241, fixes #1010, fixes #913, fixes #493 since those will be obsolete

[loosebazooka]

@TadCordle can you set up that PR (in parallel to this) with alternative options for

1. An optimized application dockerfile

• maybe a link to that project that generates dockerfiles

2. Ways to inspect the image

These can be super short: It's not really our project's goal to do this.

[chanseokoh]

For manual inspection, I find dive complete and comprehensive: https://github.com/wagoodman/dive Extremely versatile and feature-rich interactive tool to inspect files in each layer.

Not that we should promote it. I guess the tool is from some random developer.

[loosebazooka]

LGTM 🚢