Init alkane and webserver-content to install VimbAdmin
Summary:
This commit will permit to install ViMbAdmin and update it
with salt or with jenkins.
Ref T1932
Test Plan: alkane deploy mail.nasqueron.org
Reviewers: dereckson
Reviewed By: dereckson
Maniphest Tasks: T1932
Differential Revision: https://devcentral.nasqueron.org/D3343