update CC_RUN_COMMAND + fix default callout in dark mode

[juliamrch]

Checklist

• My PR is related to an opened issue : CC_RUN_COMMAND has no effect on Docker runtime #9

⚠️ If changes affect GitHub Action files

• I have added tests to cover my changes : link

Pull request type

Please check the type of change your PR introduces:

• Documentation content changes
• Bugfix on the site: fix default callout on dark mode
• Build related changes
• Other (please describe):

Description

A summary of the changes

A note about CC_RUN_COMMAND with no effect on Docker instances has been added (ran myself into this issue a few days ago), as a default callout.

Took the opportunity to fix dark mode for default callouts.

Both changes can be compared here:

• this branch: http://clever-doc-review-cc-run-docker.cleverapps.io/doc/reference/reference-environment-variables/#control-the-deployments-behavior
• main branch: https://developers.clever-cloud.com/doc/reference/reference-environment-variables/#control-the-deployments-behavior

Why is this needed?

It's needed because otherwise, users will try to add CC_RUN_COMMAND to a Docker instance to fix deployment issues, but this won't have any effect and not debugging anything. It saves time for our users and discourages them to try this method and encourages them to use CMD in their Dockerfile instead.

Reviewes

Who should review these changes? @Bencaddyro

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