Remove regulations from API

[cnlucas]

What we’re after

After our eregs app is shut down and the deprecation timeline has passed, we should remove regulations from legal/search endpoint as the regulations will no longer be updated or needed for the website.

Remember to remove eregs variable from creds as well.

Action item(s)

(These are the smaller tasks that should happen in order to complete this work)

• [ ]

Completion criteria

(What does the end state look like - as long as this task(s) is done, this work is complete)

• Regulations are removed from legal/search