Provide full configuration for Arcanist wrapper as user
Summary:
The image provides a bash config and some symbolic links in /root,
this change mirrors them in home directory.
This is a follow-up for 4d419de04afb.
Test Plan: Tested on Dwellers with arc shell
Reviewers: dereckson
Reviewed By: dereckson
Differential Revision: https://devcentral.nasqueron.org/D2347