Change custom style.css file for examples

[elenatorro]

Context

For the examples, we're using a custom css for the widgets, legends and other elements. Everytime we release a new version of CARTO VL and update the developer center, the link to that references this style changes.

If we have:

<link href="https://carto.com/developers/carto-vl/v1.2.5/examples/maps/style.css" rel="stylesheet">

And then release a patch version, we'd have:

<link href="https://carto.com/developers/carto-vl/v1.2.6/examples/maps/style.css" rel="stylesheet">

However, the previous link https://carto.com/developers/carto-vl/v1.2.5/examples/maps/style.css won't work anymore.

Therefore, if someone has copy-pasted an example from the developer center, as soon as we release a new version, this won't work.

Although you can change the link to use the current version, we should fix that to avoid confusion. I think we should upload this file to the CDN every time we release a new version, and then change the developer center accordingly to use this new link.

I'd upload to the following path:

https://libs.cartocdn.com/carto-vl/custom/v1.2.3/style.css