Tailblazor

I'm currently working on an overhaul of tailblazor.dev and tailblazor-templates. For tailblazor.dev, this is primarily a content rehash. It will be moved to .NET 7, but it seems the only functional difference will be making use of the new progress properties.

• Bump to .NET 7
  • make use of .NET 7's new progress info
  • Rewrite content to use the new blazorwasm-empty template
• Make home page more of a hybrid TOC / "What's in the box" landing page for tailblazor-templates users.
• Flatten things out a bit, consider breaking it down differently.
• mention wasm tools
• @import gotcha re: QuickGrid / other external stuff
• Finish the "see also" page and link it.
• Ensure settings.json are up to date: things like explorer.fileNesting, terminal.integrated.autoReplies, etc.
• Ensure tasks and watch scripts are up to date.
  • For instance, put everything related to VS, VS Code, dotnet CLI in their own location rather than peppered throughout.
• Make sure to mention suggested vscode settings.
• Other current issues
• ...