Fix navigation to be closer to design specs

[louismaximepiton]

Note: Please transform - [ ] into - (NA) in the description when things are not applicable

Related issues

Closes #365.

Description

Removed license, team and cookies from the sidebar.
Update footer links.
Add a supra bar.
Add GitHub link.
Need to check the design with designers.

See another rendering or see first comment

Motivation & Context

? Read #365.

Types of change

• Refactoring (non-breaking change)

Checklist

Accessibility

• My change follows accessibility good practices

Design

• My change respects the design guidelines defined in Orange Design System
• My change is compatible with responsive display

Documentation

• My change introduces changes to the documentation and/or I have updated the documentation accordingly

Checklist (for Core Team only)

• Manually test on simulators and on a physical device (Android & iOS, orientation change, dark/light mode)
• Code review
• Design review
• A11y review

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[julien-deramond]

One possible solution for the mobile rendering as a quick win:

By adding width: 100% and border-left: 0 to the <div id="offcanvasWrapper"> (somewhere around this <div>).