refactor!: rename course_authoring subdomain to content_authoring

[mariajgrimaldi]

Description

When reviewing #200, I suggested using the subdomain course_authoring when in reality, it was called content_authoring. This PR correctly names the authoring subdomain to content_authoring according to the DDD docs for the Open edX ecosystem: https://openedx.atlassian.net/wiki/spaces/AC/pages/663224968/edX+DDD+Bounded+Contexts

Here is the PR fixing the subdomain name in edx-platform: openedx/edx-platform#36109

Deadline

ASAP to avoid implementing more filters in the wrong subdomain.

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• Delete working branch (if not needed anymore)
• Upgrade the package in the Open edX platform requirements (if applicable)

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[feanil]

Makes sense.

[felipemontoya]

The change itself makes a lot of sense.
The filter has not been up too long so there are likely very few users (only edunext maybe). I think the migration plan is good for this case.