Small fixes to the CSS of the main navigation: remove text decoration on...

Renaud CUNYrequested to merge
issue/localgov_base_france-3578544:3578544-tweak-main-navigation into 1.0.x

Small fixes to the CSS of the main navigation: remove text decoration on links, and add a drop-shadow effect, as per DSFR

Closes #3578544

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