* ci: add e2e vercel test action
This commit adds several end-to-end tests that can be used
to test whether the Vercel Preview deployment successfully
returns the cards.
* test: add additional e2e card tests
* test: improve e2e card tests
This commit makes sure that the tests also check whether a valid cards
are returned from the preview deployment.
* 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>
