ux: judging slider colors

[q9f]

i propose to change the judging sliders as follows:

• default value should be 0 everywhere
• the slider should be grey if judging is not "done" yet
• the left of the slider bar should be dark grey (equals score), the right of the slider light grey
• after clicking "i'm done", the dark grey should become an affirmative green

the green will be a strong indicator that this score has been recorded as "final"

[q9f]

bonus: the sentence "nothing more to judge" should only be visible when all sliders are confirmed (green)

otherwise, it should say something like "please confirm all your judgements by clicking i'm done"

[kirushik]

Closed via https://github.com/ethb3rlin/Submi-ions/commit/61938a1c11ce06d388239f8af8337062a16a0e93

[kirushik]

@q9f would appreciate CSS help with slider colors; I've done something, but it's not exactly what the issue asks for.