* Update Elixir Installation instructions
Link to official installation guide
Mark asdf as recommended for easier switching of versions
* Remove recommended tag on asdf
Co-authored-by: Henrik Lissner <accounts@v0.io>
These instructions were tested on openSUSE Tumbleweed and openSUSE Leap
15.1. There are some modules left that are not documented yet, but this
already improves the sitution for common openSUSE users.