Add canonicalUrl to point to grafana.com/docs/k6 pages (#1429)

* Set `canonicalUrl` for non-markdown pages

* Update canonicalUrl for non-markdown pages

* prepare `canonicalURLs` for `translated-guides/en`

* Update canonicalUrl for translated-guides section

* Update canonicalUrl for xk6-disruptor

* prepare `canonicalURLs` option on `javascript api` folders

* prepare `canonicalURLs` option on `Examples` and `Extensions` folders

* prepare `canonicalURLs` option on `jslib` and `xk6-disruptor` folders

* Update canonicalUrls for examples section

* Update canonicalUrls for extensions section

* Update canonicalUrls for xk6-disruptor section

* Update canonicalUrls for root js api pages

* Update canonicalUrl for js-api 1

* Update canonicalUrl for js-api 2

* Update canonicalUrl for jslib section

* Fix  jack's script findings

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Co-authored-by: Pepe Cano <[email protected]>

Author: heitortsergent