Cleanup

[cryptix]

Wanted to understand better how this works and did some scrubbing along the way.

• removed unused vars/requires
• moved the random caps generate into one place
• moved from sbot@13 to ssb-server@14
• fixed the URLs in package.json

[dominictarr]

thank your for going over this stuff!

merging

[dominictarr]

@mixmix I have merged this but I don't have rights to publish ssb-peer-invites (haha, shoe is on the other foot!)