docs: how to enable capacitor

[ceceliacreates]

• Adds more instructions for running an app on Android and iOS with Capacitor, including environment setup requirements.
• Updates installation instructions to use Ionic CLI to ensure all Capacitor packages are installed correctly when adding Android or iOS
• Removes yarn commands, which don't install the packages

Note: if people want to use yarn cap add ios/android they could, but would need to run yarn install @capacitor/ios/android first. I can clarify this in the docs, but would recommend they just use the Ionic CLI for simplicity.

This should resolve #114.

Thanks!

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[danielroe]

Thank you! ❤️