Adjustable number of last visited repos

[zc-devs]

Clear and concise description of the problem

Now, last visited repos header have 4 items.

1. It might confuse, in which directions it is sorted in desktop view. Screenshot 2024-11-21 131025
2. it might fill too much space on the screen. Screenshot 2024-11-21 175000 ^ almost a half of 4K
3. One might want to disable this header completely.

Suggested solution

Make the number adjustable. 0 - disabled.

Alternative

Make the number of last visited repos = 2.

Additional context

WP next-350082cd19, Gitea 1.22.3, Postgres 16, Kubernetes v1.30.6+k3s1 https://github.com/woodpecker-ci/woodpecker/pull/4386#issuecomment-2490781907

Validations

• [X] Checked that the feature isn't part of the next version already [https://woodpecker-ci.org/faq#which-version-of-woodpecker-should-i-use]
• [X] Read the docs.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.