Fixing the Capybara Webkit Gem installation - QtWebKit is no longer included with Qt 5.6 error on M1 Mac with Big Sur

If you installed any version above 5.6 make sure you uninstall all those versions, for instance:

```shell
MacBook-Air:myproject heridev$ brew uninstall qt
Uninstalling /usr/local/Cellar/qt/6.0.3_2... (8,233 files, 158.7MB)
MacBook-Air:myproject heridev$ brew uninstall qt@5
Uninstalling /usr/local/Cellar/qt@5/5.15.2... (10,688 files, 367.9MB)
```

Then we need to install the 5.5 version (old version):

```shell
cd $( brew --prefix )/Homebrew/Library/Taps/homebrew/homebrew-core
git checkout 9ba3d6ef8891e5c15dbdc9333f857b13711d4e97 Formula/qt@5.5.rb
// this will install the qt from shopify/shopify
brew install qt@5.5
```

And make sure you add the qt PATH in my case:

```shell
echo 'export PATH="/usr/local/opt/qt@5.5/bin:$PATH"' >> /Users/heridev/.bash_profile
source ~/.bash_profile
```

Now, you should be able to install the capybara webkit gem without any problems

heriberto-perez
May 5, 2021