Inactive email suggested on github page

[veprbl]

Inactive email in

eic.github.io/_software/github.md

Line 37 in b2a6384

The {% include navigation/findlink.md name='github' tag='EIC GitHub Organization' %} is available for the whole EICUG. For membership, please send your GitHub username to [eicug-computing-infrastructure-support@eicug.org](mailto:eicug-computing-infrastructure-support@eicug.org?subject=GitHub%20Account)