Update intro.rst with links to how to contribute to the Koha project as a whole.
As discussed on https://tree.taiga.io/project/ldjamison-kohadocs-1805/task/702 , Sorry it's taken so long for the submission :(
As discussed on https://tree.taiga.io/project/ldjamison-kohadocs-1805/task/702 , Sorry it's taken so long for the submission :(