Analytics and social media should be plugins. #186
Description
In the spirit of simplicity, hardcoded social media (X-formerly-known-as-twitter, facebook, etc) and analytics (google, etc) should be broken out into plugins, as laid out in PR #161
The benefits are that specific sites and URLs don't end up being magic values in the main script.
The detriment is that a system of plugins must be maintained distinct from the main script.
Thoughts?