simpler and updated docs copy for icon font file paths

BS3 commits: b35840e48d18c49fdb916e04516d29b534d64875
fixes 13769

BS3 commits: 2535f7c79ad98bcb372636c9c6ff90841ffd1c37
consistency between sub menu and dropdowns
Update docs for Jekyll 2.x.

BS3 commits: ff9ab6ce21571094ae6aee219c7694f7ae2f04d5
ntegrate ZeroClipboard to easily copy code snippets. Refactor and restyle.

BS3 commits: 250e021ff1206a70188e46bc5ade81b491d50196,
7d1365ce1cb5073754d92f2bd3c99689a958c5f6
Run `grunt dist`.

BS3 commits: 1b8935ee9514873d000b15dedeedb98a5457dd8b
grunt

BS3 commits: 9e1652aa50a9d315d333362b68de88e931dc872b
Fixes #13616: Add custom gutter support to containers. grunt for table change

BS3 commits: e06970948b963fa2fb11583533f726a3a8051967,
4aca4cf8661ab6e17ffd58820679a081db80ceaa