Linux CUDA brownout 25th Sept

[kbatuigas]

Description

Update Linux CUDA pages to display brownout notice (brownout #3, 25th Sept)

Reasons

Final scheduled brownout https://discuss.circleci.com/t/linux-cuda-deprecation-and-image-policy/48568
Images removed 30th of September

Content Checklist

Please follow our style when contributing to CircleCI docs. Our style guide is here: https://circleci.com/docs/style/style-guide-overview.

Please take a moment to check through the following items when submitting your PR (this is just a guide so will not be relevant for all PRs) 😸:

• Break up walls of text by adding paragraph breaks.
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