chore: reorganize playground

development/playground/i18n-updater/updater.js

development/playground/icons/index.html

development/playground/icons/main.js

development/playground/icons/main.pcss

...opment/playground/monster-bind-with-datasource/index.html

development/playground/monster-bind-with-datasource/main.mjs

development/playground/multiids-dom/data.json

development/playground/multiids-dom/index.html

development/playground/multiids-dom/main.js

development/playground/multiids-dom/main.pcss

development/playground/popper/index.html

development/playground/popper/main.js

development/playground/popper/main.pcss

development/playground/rest/data.json

development/playground/rest/index.html

development/playground/rest/main.js

development/playground/select-fetch/index.html

development/playground/select-fetch/main.js

development/playground/select-fetch/main.pcss

development/playground/select/data.json