refactor: cleaning build, old resources

.gitignore

.gitlab-ci.yml

Dockerfile

build-plugins.sh

deadlock-extension/README.md

deadlock-extension/demo.gif

deadlock-extension/media/cat.gif

deadlock-extension/media/main.js

deadlock-extension/out/extension.js

deadlock-extension/out/extension.js.map

deadlock-extension/src/docs/briefing.md

deadlock-extension/src/docs/fr/briefing copy.md

deadlock-extension/src/docs/fr/briefing.md

deadlock-extension/src/docs/fr/hint1.md

deadlock-extension/src/docs/hint1.md

deadlock-extension/src/extension.ts

plugins/deadlock-extension/.eslintrc.js

plugins/deadlock-extension/.vscode/extensions.json

plugins/deadlock-extension/.vscode/launch.json

plugins/deadlock-extension/.vscode/settings.json