Fix googleability of docs

[brson]

Googling for Rust documentation gives very inconsistent results, often to very old docs. Newbies often are led astray.

Old description:

This is a topic I haven't paid much attention to, but it's important, and I know our googlability has traditionally been very bad. I don't know at all what needs to be done off hand but it's something we should dedicate some effort to.

Nominating.

Tasks:

• description and keyword meta for home page
• description and keyword meta for standalone docs (needs rustdoc needs a way to specify HTML metadata for standalone docs #16178)
• description and keyword meta for crate docs
• descriptive titles for standalone docs
• teach rustdoc to meta (rustdoc needs a way to specify HTML metadata for standalone docs #16178)
• add <link rel="canonical"> to docs (needs rustdoc needs a way to specify HTML metadata for standalone docs #16178)

[alexcrichton]

cc #9461

[pnkfelix]

To clarify, the particular problem that has plagued us is that it is too easy to end up with outdated documentation when googling for help with problems.

[pnkfelix]

Assigning 1.0, P-high.

[emberian]

I imagine this could be partially alleviated with some well-placed meta tags.

[Valloric]

The very first step should be reading Google's Webmaster Guidelines and related documents.

Also, here's a good doc Google has prepared on sensible SEO things webmasters can do.

I imagine this could be partially alleviated with some well-placed meta tags.

Here's a really nice video on the topic of meta tags and their usefulness by Google's Matt Cutts: https://www.youtube.com/watch?v=RBTBEfd7z_Y

[adrientetar]

The DNS issue is #4394.

[brson]

@Valloric thank you for those helpful links.