website: Added "canonical" tag

With this tag, a "canonical" or "prefered" version of the page may be
specified. This prevents duplicate content issues in search engine
optimization.

Usage:
```
---
layout: post
title:  "An example blog post"
author: Anon
date:   2020-11-02
canonical: https://example.org/canon
categories: project
---
```

The above will insert
`<link rel="canonical" href="https://example.org/canon"/>` in the page's
<head>. This assumes the content on this page is a duplicate of
https://example.org/canon, and https://example.org/canon is the
preferred version.

Change-Id: I2932200b114223845d36ee6a05809fa8f8a7aace
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/36915
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: Jason Lowe-Power <power.jg@gmail.com>
1 file changed