update use-calcite-components widget to use the new `calcite-components` entry

[qlqllu]

@gavinr The way of using calcite components is updated, can you review this PR?

[gavinr]

The wording now looks ok, but I'm having some issues running the new sample code. I'll wait until I'm able to fully test that.

[qlqllu]

@gavinr Thanks!