Add examples for transform property

[makella]

The links below aren't the maps that we will make for the examples on dev center, but links that demonstrate the suggested concept

• basic translate
• basic rotate
• data-driven
• with a ramp
• combine

[makella]

[makella]

transform to give buildings some height variation: https://cartodb.github.io/carto-vl/examples/editor/index.html#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