Add 2025 sponsor information page (#1048)

- [ ] due dates tbd
- [ ] submission channels tbd
- [ ] shipping tbd

05566e4
commented out most of the unready things. Most of the deadlines are left
as TBD. As we need this ready before sending the contract, we can
consider merging this as soon as reviewed and add the due dates and
submission details in another patch.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: hypha