Add https://fetlife.com/ios page

[jidanni]

There is https://fetlife.com/android but no https://fetlife.com/ios nor OS X link. Perhaps just have https://fetlife.com/ios redirect to https://github.com/fetlife/ios until one day somebody writes a pretty page like https://fetlife.com/android .

[jidanni]

And any IOS FAQ should also mention Android versions, and the website.