Blazor Overview topic UE pass

[guardrex]

Addresses #19286

Internal Review Topic

Recommendations on this PR:

• As I perform full UE passes, let's update the doc dates. These updates will reflect up-to-date guidance for these topics.
• We've learned that the readership here is broad, spanning those familiar with MS tech to devs from other SPA frameworks and new developers without experience with MS tech and programming. I provide some additional cross-links to specialized MS terminology here. Links that redirect without a trailing slash are provided with the slash to avoid the redirect.
• The purposes of the Bootstrap card in the Dialog component example are to display the component ...
  • With 🌷 component beautification 🌹. A pleasant rendering is less important than the technical aspects, but it's low cost and pleasing to the 👁️.
  • Showing how close components/Razor syntax is to natural HTML and how Blazor integrates with Bootstrap.
  • In a bordered element. The bordered style makes the nested component rendering clearer in the rendered Index component page.
• Let's show the full browser window in dialog.png and complete the demonstration with the developer tools console showing how C# wrote a message there.
• The rest of the updates are style nits in the lingo.

Here's the proposed image for dialog.png ...