Improve on code for satellite sites

[nilsml]

In order to make the job of adding new satellites sites less error-prone, we need to make the code more robust

Possible actions

• Have everything typed (not possible atm because of next.config.js)
• Create a DSL for configuring the satellite sites. Example: satellites.add(newsatellite('germany').useDataset('germany').withLanguage('german').alternative('english'))
• Use functional concepts for the satellite config:

const newSatellite = (name: string): SatelliteSite => …
const useDataset = (s: SatelliteSite) => (dataSet: string): SatelliteSite => …
const withPrimaryLanguage = (s: SatelliteSite) => (language: string): SatelliteSite => …
const build = (s: SatelliteSite): ConfiguredSatelliteSite => …

const buildGermanSatellite = pipe(newSatellite('germany'), useDataSet('germany'), withPrimaryLanguage(('german'), build)

• Connect the content in the datasetHelpers.ts more closely to the satellites config

[nilsml]

The setup we have now works pretty well.