Squashed 'static-content/dotnet/' changes from a7d6c8d..c2aad9f

c2aad9f add social sharing widgets
8fdd81e add social sharing widgets

git-subtree-dir: static-content/dotnet
git-subtree-split: c2aad9fa77ba4c28febbdfd54e34dcbaba1e7c50
add social sharing widgets