chore: remove canonical function and references

[jaygiang]

Removed CanonicalUrl component and all references. Setting trailingSlash: false in docusarus has resolved the Canonical issue that was merged in this PR.

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
  If this pull request addresses a security vulnerability,
  I confirm that I got approval (please contact security@ory.com) from the maintainers to push the changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added the necessary documentation within the code base (if appropriate).

Further comments

Note for @unatasha8: I'm removing this from all index.mdx which I added a month ago to fix SEO issues with Canonicals, but with the recent update, this is no longer needed. This change will not affect how index.mdx behaves and your plans to restructure.

[vinckr]

lgtm 🚢