chore: Tagline: minor UI changes (paddings)

[g123k]

Hi everyone,

Here are a few minor changes:

• Some paddings (e.g.: horizontally with the search bar)
• Matomo event for the click on the link (default behavior)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 7.19%. Comparing base (4d9c7fc) to head (5326c3f). Report is 226 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #5440 +/- ## ========================================== - Coverage 9.54% 7.19% -2.36% ========================================== Files 325 391 +66 Lines 16411 20339 +3928 ========================================== - Hits 1567 1463 -104 - Misses 14844 18876 +4032 ```

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