Provide better track id

[Enngage]

In

kickstart-angular-app/src/app/components/page-content/page-content.html

Line 2 in 036b0f8

@for (item of items(); track $index) {

you should ideally provide a unique identifier of the block instead of relying to $index ->

In some cases, especially with static or less dynamic data, you might find `track $index` handy. However, be cautious as it isn't a one-size-fits-all solution. If you're dealing with mutable data or frequent changes, it might behave
unpredictably. It's best to stick with a unique and immutable property from your data as the tracking key; this ensures
objects are identified correctly. Context matters a lot, so choose the `track` expression that fits your data
scenario.```