Merge #243

243: Remove unecessary files added in the npm package r=bidoubiwa a=bidoubiwa

These files were added in the package in `npm` but they are not useful to the well function of the plugin

Co-authored-by: Charlotte Vermandel <charlottevermandel@gmail.com>

Author: meili-bors[bot]

.npmignore

@@ -1,6 +1,13 @@
 scripts
 .editorconfig
 .eslintrc.js
+.eslintignore
+.prettierrc
 .github
 tests
 jest.config.js
+assets
+playground
+babel.config.js
+bors.toml
+CONTRIBUTING.md