Revert "Port to lit 2.0"

packages/app-shell/package.json

packages/app-shell/src/app-shell.js

packages/app-shell/src/auth-menu-button.js

packages/app-shell/src/build-info.js

packages/app-shell/src/dbp-activity-example.js

packages/app-shell/src/dbp-app-shell-welcome.js

packages/app-shell/src/tugraz-logo.js

packages/auth/package.json

packages/auth/src/dbp-auth-demo.js

packages/auth/src/login-button.js

packages/check-in-place-select/package.json

packages/check-in-place-select/src/check-in-place-select.js

...eck-in-place-select/src/dbp-check-in-place-select-demo.js

packages/common/dbp-common-demo.js

packages/common/package.json

packages/common/src/adapter-lit-element.js

packages/common/src/button.js

packages/common/src/icon.js

packages/common/src/inline-notification.js

packages/common/src/mini-spinner.js