Merge pull request #12 from contexthub/doc-update

Doc update
Merge pull request #13 from contexthub/doc-update

Remove all footer links except Twitter
Merge pull request #14 from contexthub/doc-update

Update Twitter icon in footer
Merge pull request #15 from contexthub/doc-update

Doc update
Merge pull request #16 from contexthub/doc-update

Doc update
Update index.md
Update index.md
Merge pull request #17 from contexthub/beaconbits

Add non-linked Beacon Bits stub page
Update w/ Beacon Bits copy and images