Issue and pull request filters on organization dashboard

[jpraet]

• Gitea version (or commit ref): 1.13
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No

Description

The user dashboard has these "Assigned to you", "Created by you", "Mentioning you" filters for issues and pull requests.
The organization dashboard currently does not have these. It only has "In your repositories". I'm not sure why that is? If you have access to multiple organizations it can be very useful to have these same filters within organization scope.