This commit adds the `stale-theme-pr-closer` closer action. This action
is used to close theme pull requests with an `invalid` label that has
been stale for a given number of `STALE_DAYS`.
* GRS-1955: Using ES6 import/export in src files
* GRS-1955: Using ES6 import/export in test files
* GRS-1955: Using ES6 import/export in themes index.js
* GRS-1955: Readding blank line at end of top-languages-card.js
* feat: fix test es6 import errors
This commit makes sure jest is set-up to support es6. It also fixes
several test errors and sorts the imports.
* test: update test node version
This commit makes sure node 16 is used in the github actions.
* refactor: run prettier
Co-authored-by: rickstaa <rick.staa@outlook.com>
