[Docs] Add extrahead for google site verification

[stichbury]

Description

Resolves internal ticket 1412. Builds a meta tag into the docs pages for Google search console to confirm we own the site and thus can receive information about the searches made on google that pushed traffic to us.

Screenshot

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[github-actions]

View the example dashboards of the current commit live on PyCafe ☕ 🚀

Updated on: 2025-01-23 11:22:41 UTC
Commit: d9b90d5

Link: vizro-core/examples/dev/

Link: vizro-core/examples/scratch_dev

Link: vizro-core/examples/visual-vocabulary/

Link: vizro-ai/examples/dashboard_ui/

[huong-li-nguyen]

Totally unrelated to this, but as long as I remember - do you mind adding https://github.com/manuelkonrad as an author/contributor to https://vizro.readthedocs.io/en/stable/pages/explanation/authors/?