README: Remove bits already in other places

Part of #51.
Cleanup: Remove unused parameters
Cleanup: Remove unnecessary function
Cleanup: Set attributes when creating the object

This will ease understanding the code.
Cleanup: Convert function into method
Cleanup: Merge populate_project_links() into __init__()

Having this method apart requires extra calls that we actually
don't need at all.
Cleanup: Set the attributes on object creation

Code is easier to understand this way.
Cleanup: Get rid of global variable

Part of #60.