[OUDS] Add Teams and discussion contacts and deactivate search

[hannahiss]

Related issues

Closes #

Description

• hide search icon in header
• add contacts (discussion and Teams) in footer and team page

Checklists

• I have read the contributing guidelines
• My change follows the developer guide
• My change follows the page structure defined in [OUDS] Create a component page template for the doc #3045
• Title and DOM structure is correct
• Links have been updated (title change impacts links for example)

Progression (for Core Team only)

• Code review
• Commit on ouds/main following conventional commit

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[MaxLardenois]

LGTM