WIP - Try to fix scrapping using waitForNavigation and waitFor

[yangsu]

Thanks for trying to fix this issue. I ran into issues similar to #80 and #84. I tried to use this branch to run the auto backup using github actions, which didn't work. I ended up tweaking the github actions config to use python 3.9 instead since i noticed that pyppeteer was using 3.9 locally when i was running locally. Here's the first step of my config. It's been working so far. 🤞

    steps:
      -   uses: actions/checkout@v2
      -   name: Set up Python 3.9
          uses: actions/setup-python@v2 
          with:
            python-version: 3.9

[MatthieuBizien]

Closed in favor of #92 (lesson learned: prefer battle-tested librairies!)