* templates/partials/analytics.html: Upon a client load of the website, determine which site
they are viewing (dev, staging, production) and setup plausible analytics appropriately.
* templates/default.html: Remove non-functional piwiki script reference and replace with a
reference to the new partial template for analytics
* src/site.hs (main): Remove remnant of application cache support
* js/default.js: Remove unneeded analytics code specific to piwiki. No additions were made here in support of plausible
* TODO.org: Mark associated TODO item DONE
