Add www.elnätsavgift.se to the repository information

[HuggeK]

The data for the chart is a ledger over all api? Is it querying the api´s in the backend or is it statically generated? #40
https://www.xn--elntsavgift-n8a.se/v%C3%A4lkommen.html

[avajadi]

The chart is generated statically, but updates every time there is a change in the service catalogue. This is due to limitations in the publishing platform used, but doesn't really impact anything much as changes are not that frequent.