Add an endpoint for sharing known_hosts

[danielemery]

• Add another endpoint so that I get wget to ~/.ssh/known_hosts
• This is so when setting up a new machine I don't have to manually accept each known host - not only is this an inconvenience it's also insecure as I tend not to check the fingerprint
• With this approach anything added to the config file would first be checked to make sure it's the correct fingerprint