Update angular examples to v20 #25
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Angular released a few versions since #17 (from v17 to v20) and it brought a lot of updates (signals, coding style, ...)
This PR aims to update the examples to keep them up to date for the two existing examples:
v2-angular-classless-loginandv2-angular-color-schemes-and-modal.Both examples build and run successfully:
I also updated Pico to v2.1.1.
Please let me know if I need to change anything else, and once again: thanks for the awesome work with this!