Re: [manifest] Add meta tags equivs. for features were possible (#350)

> Some of my issue with this is that the meta tags describe things related to the page and the manifest describes things relate to an installable experience and it is a subtle difference.

I think this is the key point. If a web site is a collection of web pages then a web app is an installable web site, not an installable web page.

Until now we've not really had a way to provide metadata about a web site as a whole, only about individual pages, the manifest provides this. I'm not sure a web page is the right place to store metadata about a web site. This would require adding metadata like below to every page of a web site:

```
<meta name="application-lang" content="en">
<meta name="application-name" content="My App">
<meta name="application-short-name" content="My">
<meta name="application-scope" content="/">
<meta name="application-icon" content="/icon.png">
<meta name="application-display" content="standalone">
<meta name="application-orientation" content="portrait">
<meta name="appllication-start-url" content"="/index.html">
<meta name="application-theme-color" content="blue">
```

You could do it like that, in the same way that you could inline your CSS on every page. It just seems more efficient to put it in a separate file and link to it with a link relation, like we do with other resources that are shared between multiple pages of a web site, like stylesheets.

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