fix: gnoweb UI styles

[alexiscolin]

This PR aims to fix some of remaining UI bugs on gnoweb after the revamp merge.

Some of: #3355

• Fixes Safari select input design and icons
• Fixes input hover
• Fixes ToC font style
• Fixes UI details and improve CSS
• Fixes Responsive with long content
• Fixes Scrollbar
• Fixes fonts loading strategy and size
• Fixes ts issue with copy btn (quick clicks)
• Fixes some A11y

[Gno2D2]

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