Is your feature request related to a problem? Please describe.
When I am searching for a post that I know in which magazine it was I want to be able to limit the search results to posts in the magazine

Describe the solution you'd like
The search form should have input fields for the magazine and user. When filled out the search results should be limited to the magazine and author if one is provided.
When I click the search icon and I was in a magazine the form should be pre filled with the magazine. When I was on the profile page of a user the user field should be pre filled with the user

Describe alternatives you've considered
none

Additional context
none