update licensing for included components

[mattstratton]

There are a few open source components we use (bootstrap-sortable is one that comes to mind) and to be proper OSS citizens, we should include those licenses in this repo.

I'm thinking we update LICENSE to include something like this:

This project includes COMPONENT_A and which is available under a 'MIT' License.
For details, see:
/LICENSES/COMPONENT_A-MIT-LICENSE

This product includes COMPONENT_B and which is available under a 'Apache-2.0' License.
For details, see:
/LICENSES/COMPONENT_B-LICENSE

[mattstratton]

See https://github.com/devopsdays/devopsdays-web/blob/master/LICENSE for example.

[mattstratton]

Components to include:

Bootstrap - https://github.com/twbs/bootstrap/blob/master/LICENSE
hugo-snippets - https://github.com/nozzle/hugo-snippets/blob/master/LICENSE

social-share-kit

Social Share Kit
-----------------

Social Share Kit by is licensed under a
Creative Commons Attribution-NonCommercial 3.0 License
Read more: http://socialsharekit.com/#license

See online version of this license here:
http://creativecommons.org/licenses/by-nc/3.0/

(we should add language to the license that if ado-hugo is used on a commercial site, they are responsible for acquiring their own license for SSK)

[mattstratton]

Resolved in #343