Move slides in front-end section Transport fuels to Transport

[kndehaan]

Background
The front-end section Transport fuels currently contains slides and sliders that set the fuel composition of different transport categories. It makes more sense to move these sliders to the Transport section under demand where users make assumptions about transport mode technology.

In a discussion with @Charlottevm and @mabijkerk, we came to a shared idea of moving these slides to the Transport section under Demand.

Solution

• Move slides to new sub section named 'Transport fuels' under Demand > Transport, below International transport
• Remove sidebar item 'Transport fuels'
• Nice-to-have: improve the text in the overview slide of Transport (e.g. make use of bullets)

This issue can be taken up as part of Koolstofmodellering project.

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[kndehaan]

This issue will be taken up in the carbon modelling project.