Changing dockerfile to accept primary styling

[Fox4Fun31]

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I haven’t done this before, so apologies if anything is off. I just thought it would be useful because I’m not a big fan of the default green. This adds optional env variables to change the primary color easily, while keeping the current defaults if nothing is set.

[danielalves96]

@Fox4Fun31 Thanks for the PR!

Please, update PR description and update the respective documentation in apps/docs.

[Fox4Fun31]

Hey, I hope I did it right. Tell me if I need to redo something.

[Fox4Fun31]

Hey, I changed doe docs. What do I need to do now?