ASP.NET Core Razor components overview - split out Blazor Custom Elements sections

[timschwallie]

Blazor custom elements should have it's own page. It's that big of a deal.
Make new entry in tree, and cut-paste on new page. Done. Searching works, sort of.

In fact, this overview should be broken into many pages. Its huge. It appears to be a massive catch all and the documentation searching tool doesn't find things in it.

Feels like folks got lazy making new entries into the navigation tree.

[guardrex]

Hello @timschwallie ... Yes, this is already under consideration on a tracking issue that I keep and will probably be addressed in 23Q1.

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