docs: update docs to reflect new color palette in area charts and line charts
requested to merge 703-increase-chart-color-palette-from-4-to-30-to-reduce-frequency-of-color-repetition into main
A new color palette is being used for area charts and line charts. This should also be reflected in the screenshots used in the docs: https://docs.gitlab.com/ee/user/project/integrations/prometheus.html
The new colors are implemented in Issue #714
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