Add link to Wikipedia in gossip protocol docs

Previously, the link would simply point to '#'.
Merge pull request #96 from leocassarani/patch-1

website: add link to Wikipedia in gossip protocol docs
Adding font anti-aliasing. Fixes #104.
Fix typo

constaints should be constrains
Merge pull request #106 from garethr/patch-1

website: fix typo
Add AdvertiseAddr / AdvertisePort functionality

Signed-off-by: Ben Agricola <bagricola@squiz.co.uk>