readme: remove adopters (pingcap/docs#8725) (#35124)
readme: remove adopters (pingcap/docs#8725) (#35124)

ref pingcap/tidb#35180
ngaut/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb,pingcap/tidb,pingcap/tidb,pingcap/tidb,kyle-wang/tidb,ngaut/tidb,pingcap/tidb,pingcap/tidb,kyle-wang/tidb,ngaut/tidb,kyle-wang/tidb,kyle-wang/tidb,kyle-wang/tidb,kyle-wang/tidb,ngaut/tidb