Document how to access methods within specific model classes

[fershad]

Is your feature request related to a problem? Please describe.

CO2.js v0.16 introduced the ability to access methods that were previously private within a given model class. This was applied in PR thegreenwebfoundation/co2.js#220.

These methods could be used by developers to do more than just estimate carbon emissions - allowing them to expose information about estimated energy use, operational v. embodied emissions, and more.

However, there's no documentation for these methods.

Describe the solution you'd like

These private methods should be documented on the Methods page in the CO2.js section of the docs website.

The methods to be document are:

Sustainable Web Design v4

• operationalEnergyPerSegment
• operationalEmissions
• embodiedEnergyPerSegment
• embodiedEmissions
• ratingScale

Sustainable Web Design v3

• energyPerByteByComponent
• co2byComponent
• energyPerByte
• energyPerVisitByComponent
• energyPerVisit
• emissionsPerVisitInGrams
• annualEnergyInKwh
• annualEmissionsInGrams
• annualSegmentEnergy
• ratingScale

Describe alternatives you've considered
We've tried to expose these via alternate tooling like JSR, however that's no possible without a rewrite of the library to TypeScript which is something we're not in a position to steward at this time.

[fershad]

Rather than dumping this into one huge PR, these changes can be split into two separate PRs (one for v3, one for v4)