add stairways backend

[vtm9]

• create tournament template for react client
• add Header for Tournament
• [#963] created TournamentChat for Tournament
• add participants list for individual tournament
• add UserInfo component, change JoinButton
• refactoring Header
• refactoring Header
• add client/server endpoints for tournamnets
• improve and resolve individual tournaments
• add TODO for tournaments
• tournament improvements
• --wip-- [skip ci]
• create individual tournament mvp
• --wip-- [skip ci]
• --wip-- [skip ci]
• Finish backend for stairway tournament
• add stairway template
• add output example data
• add StairwayOutputTab component
• add StairwayEditorTab component
• --wip-- [skip ci]
• Fix old tournaments render
• Minor improvements
• Fix tests
• add stairway editor tollbar and refactor stabs
• add staiway template route
• minor fixes and add PlayerPicker
• add some cool staff on tournaments
• --wip-- [skip ci]
• --wip-- [skip ci]
• add StairwayRoundsContainer
• Move react tournaments to separated namespace
• --wip-- [skip ci]
• --wip-- [skip ci]

closes #ISSUE_ID