Fix overlap sidebar for Tablets and up in docs

BS3 commit 55120d124c6b9d0f43fa348963ecb67d79326fc2
Replaced <i> with <span> for glyphicon

BS3 commit 5fe3de1cb34b8a0307ce3f095e8d08f3fc4bf871
Move grid offsets to desktop only. restore proper table grid class behavior

BS3 commits 573a19741770338b9e08838d908f51b7a82cddd3 and
b76d98eee3fa4a1a8d7fb281a31a7d20982459d3