Revert "stable"

This reverts commit 8a86808e8063dab6ce6f66eb872ab0a53a46ffd7.

# Please enter the commit message for your changes. Lines starting
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# On branch main
# Your branch is up to date with 'origin/main'.
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# Changes to be committed:
#	deleted:    .gitignore
#	deleted:    Transcendence/.gitignore
#	new file:   Transcendence/README.md
#	deleted:    Transcendence/a_faire.txt
#	new file:   Transcendence/srcs/backend/avatar/user_2_1771805216827.jpg
#	modified:   Transcendence/srcs/backend/routes/game_room.js
#	modified:   Transcendence/srcs/backend/services/game_room.js
#	modified:   Transcendence/srcs/backend/services/socket.js
#	new file:   Transcendence/srcs/frontend/src/ajout du multiplayer
#	modified:   Transcendence/srcs/frontend/src/app.js
#	modified:   Transcendence/srcs/frontend/src/avatar.js
#	modified:   Transcendence/srcs/frontend/src/config.js
#	modified:   Transcendence/srcs/frontend/src/duel.js
#	modified:   Transcendence/srcs/frontend/src/events.js
#	modified:   Transcendence/srcs/frontend/src/game_room.js
#	modified:   Transcendence/srcs/frontend/src/global_chat.js
#	modified:   Transcendence/srcs/frontend/src/login.js
#	modified:   Transcendence/srcs/frontend/src/renderer.js
#	modified:   Transcendence/srcs/frontend/src/tetris.css
#	modified:   Transcendence/srcs/frontend/src/tetris.html
#	modified:   Transcendence/srcs/frontend/src/tetris.js
#	deleted:    Transcendence/srcs/frontend/src/tetris.js.backup
#	modified:   Transcendence/srcs/frontend/src/ui.js
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