[website] Add Do-Not-Track link for analytics

[nhsz]

We should include a DNT link to let the users opt-out from Matomo, like we do on the blog or eth.org

[nhsz]

@nloureiro we have to add a link to the do-not-track matomo page somewhere on geth site (it's usually displayed in the footer). As a reference, highlighted link from the blog's footer below

[nloureiro]

I propose to add the link next to the date and copyright.

It's a common pattern to use this area to add links related to cookies, T&C etc, like this exemple

So, on the Geth website would be something like this (link to figma)

[nhsz]

I propose to add the link next to the date and copyright.

It's a common pattern to use this area to add links related to cookies, T&C etc, like this exemple

So, on the Geth website would be something like this (link to figma)

current font for the footer text is using body typography (Inter, sans-serif) 12px, are we updating these styles too? (on figma it's 10px with the heading typography)

[nloureiro]

I made the initial footer with Jetbrains, but there is no need to change it now. Keep the same font face and size as before and add the link.

[nhsz]

Fixed by #26833