feat(#458): Add DruxtAuth to DruxtSite example

[Decipher]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

• Added authentication via the DruxtAuth module to the DruxtSite example.
• Resolves Create Nuxt auth example #458

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

Testing:

In Gitpod:

1. Open PR in Gitpod
2. Run yarn example:druxt-site
3. Open site (CTRL+Click localhost:3000 link)
4. Click Login
5. Login to Drupal (Use onetime login link above Druxt welcome text, or cd docs/drupal && ddev drush uli)
6. Grant access
7. Inspect the Authenticated user in console: this.$nuxt.$auth.user

Screenshots/Media:

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⚠️ No Changeset found

Latest commit: 0c6cad9

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[codecov]

Codecov Report

Merging #547 (0c6cad9) into develop (da58130) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #547   +/-   ##
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  Coverage    96.60%   96.60%           
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  Files           86       86           
  Lines         2208     2208           
  Branches       433      433           
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  Hits          2133     2133           
  Misses          68       68           
  Partials         7        7           

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