When page-no-index is defined, configure noindex on googlebot and bingbot as well

[ggrossetie]

Currently, the page-no-index attribute does not apply to googlebot or bingbot:

docs-ui/src/partials/head-prelude.hbs

Lines 5 to 12 in 1f2107f

	{{#if (ne page.attributes.no-index undefined) }}
	<meta name="robots" content="noindex" />
	{{else}}
	<meta name="robots" content="index, follow" />
	{{/if}}
	<meta name="googlebot" content="index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1" />
	<meta name="bingbot" content="index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1" />

We should probably fix the condition:

{{#if (ne page.attributes.no-index undefined) }}
  <meta name="robots" content="noindex" />
  <meta name="googlebot" content="noindex" />
  <meta name="bingbot" content="noindex" />
{{else}}
  <meta name="robots" content="index, follow" />
  <meta name="googlebot" content="index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1" />
  <meta name="bingbot" content="index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1" />
{{/if}}