Add python websocket

websocket is required for the identity server to run.
Improved description

Included more context for first-time visitors. Included a link to the video provided by the PoC. Please consider reproducing this video with the current OpenBazaar branding. Included current status so visitors can know at a glance how we are progressing. Fixed a small typo regarding the identity server.
Merge pull request #30 from secret-bitcoin-login/master

identity server and main page context