[pt-br] Sync KubeCon section UI & 2025 links to Portuguese

[shurup]

Following the recent KubeCon links section UI update & content actualisation for 2025 (#49167), I'm applying the same changes to the Portuguese localisation.

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[shurup]

Oh, as I can see now, the last link (KubeCon NA) doesn't fit due to the longer names for months and cities (in Portuguese). I'm elaborating on possible workarounds to address this…

[shurup]

The issue described above should be fixed by #49443. It'll be good to wait for it being merged first and re-deploy this PR then to see the [better] outcome.