Fix material icon in repo share view

Merged username-removed-124398 requested to merge NicoAlt/repomaker:151-material-icon into master

Sorry for that, I should really stop copy'n'pasting classes across the project...

Screen_Shot_2017-07-06_at_22.14.58

rm-storage-header-* is just for centering, which is already done by rm-repo-share-empty.