Remove outdated reward stats from main solver dashboard #139
Description
The most prominent figure on the main solver dashboard is about reward until about 2 years ago. The corresponding query https://github.com/cowprotocol/dune-queries/blob/main/cowprotocol/solver_dashboard/deprecated_queries/solver_rewards_totals_1821285.sql is currently marked as deprecated in this repo.
The figure should probably be removed. At a later time, the figure could be replaced using a query with up-to-date information on rewards.