Update the installation instructions

Created by: chenejac

What does this pull request do?

Update the README file to make generic text about installation instructions.

What's new?

Pointing to https://wiki.lyrasis.org/display/VIVODOC/All+Documentation for installation instructions.

How should this be tested?

Check whether the message is clear and whether the English is correct.

Interested parties

Tag (@ mention) interested parties or, if unsure, @VIVO-project/vivo-committers