docs: Update theme 1.4.1

[dgarcia360]

Related issue https://github.com/scylladb/sphinx-scylladb-theme/issues/707

ScyllaDB Sphinx Theme 1.4 is now released 🥳

You can read more about all notable changes here.

How to test this PR

1. Clone this PR. For more information, see Cloning pull requests locally.

2. Enter the docs folder, and run:

   make preview

3. Open http://localhost:5500 with your favorite browser. The doc should render without errors, and the version should be Sphinx Theme version (see the footer) must be 1.4.x:

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Files changed:

• docs/index.rst https://pr-124.d2s1mlfs281q1m.amplifyapp.com/index

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Files changed:

• docs/index.rst https://pr-124.d2s1mlfs281q1m.amplifyapp.com/index

[dgarcia360]

@annastuchlik Could you please review?

[annastuchlik]

My review is pending - I need to wait for the confirmation that the Google Tag Manager feature introduced with the new theme is working in the Cloud docs.

[annastuchlik]

@DanielHe4rt This PR looks good; you can merge it. Thanks!