Add support for Umami Analytics

[fmaida]

This commit adds support for Umami Analytics ✨

As discussed and approved in #829 I'm sending you a small modification to the layouts/partials/analytics.html file that introduces support for Umami Analytics.

Umami Analytics ( https://umami.is ) is another analytics service that allows you to manage up to three domains and up to 10,000 hits per month for free.

To enable this feature, you have to add this parameter to your config file:

[umamiAnalytics]
  site = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"  
  region = "eu"  # can be either "eu" or "us"

(Usually, the file you need to modify is located under config/_default/params.toml)

I will edit Congo documentation to add further information about using this feature by Sunday evening, March 16th.

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[jpanther]

Thanks for the PR, @fmaida! I'm happy to merge this in.