Remove Redis from middleware overview

Per RI, we want people to have to go well out of their way to be told how to use
an insecure and dangerous option in production.
Minor updates to components overview page
index: mention the need for human-scale deployments
plugins: minor tweak
standard: minor tweaks
Docs: Delete content of EC2 demo page
Docs: Add minimal useful content to Vagrant demo page

On further consideration, I think the project README is the proper place
for detailed docs about this toolkit.
Docs: Mention using registration as a heartbeat (server config and standard deployment)
remove toc from demo page