Ensure GitHub Pages redeploys after scheduled run-cron job

[seanprashad]

In 1f3beff, we run https://github.com/seanprashad/leetcode-patterns/blob/master/cron/update_questions.py via https://github.com/seanprashad/leetcode-patterns/blob/master/.github/workflows/run-cron.yml to update the companies on a weekly basis.

The problem is that we don't actually redeploy the updated website, which leads to two problems:

1. Our companies tooltip doesn't automatically update
2. The list of companies/question metadata is not pulled live from our gh-pages branch, and therefore still needs a manual deploy via npm run deploy

[seanprashad]

Look into triggering a second GitHub Action: https://stackoverflow.com/questions/62750603/github-actions-trigger-another-action-after-one-action-is-completed

Need to confirm, but we could do something like:

• run_cron.yml runs on the scheduled time
• After successfully completing, run https://github.com/seanprashad/leetcode-patterns/actions/workflows/github-pages.yml to pull the updates files from the master branch, build, and then deploy them

[seanprashad]

https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#workflow_run

[seanprashad]

Working - see https://github.com/seanprashad/leetcode-patterns/actions/runs/2857435317