Use a more subtle color for the survey banner
There's been some feedback that:
The banner on top of our docs has the color of a warning, can we make it more informational so it doesn't look like there is a problem?
The initial idea was to use the same colors we use in the marketing site, taken from https://about.gitlab.com/handbook/markdown-guide/#gitlab-webcast-alert-box.
This MR changes the color to be the same as the help and feedback section.
before | after |
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