[Feature Request] Allow URL for homepage (logo image) link to be specified in docfx.json

[lanthonyneville]

As of DocFx 2.66.0 it appears that the hyperlink for the logo image (top left of nav bar) is auto-generated and set to the index page in the root of the site.

It would be useful if this URL could be specified in the docfx.json, for example as a new setting inside globalMetadata:

		"globalMetadata": {
			"_appTitle": "Company Documentation",
			"_appFooter": "© Company Ltd",
			"_appLogoPath": "CompanyIcon.png",
			**"_appLogoLink": "http://www.mycompany.com/my-page.html",**
			"_appFaviconPath": "CompanyIcon.png",
			"_enableSearch": true,
			"_enableNewTab": false
		},

An example use case is:

• The DocFx site does not run as a standalone site .... the content files are incorporated into a larger site
• Therefore end users would expect that clicking on the logo would navigate them to the home page of the parent site

[lanthonyneville]

Thanks @yufeih !!