[PT-2026] Fix images at welcome page and add kcd Porto and DevOps Porto as community sponsors

[somatorio]

Note: This includes a new shortcode to the theme

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[phrawzty]

Hello @somatorio,

The parts of this PR that touch only the PT-2026 event are reasonable; however, this PR also modifies the theme, which is a different request altogether. It will need to go through a more rigorous review by the web team, and to be blunt: that might take a while.

My strong suggestion: make two PRs. One that gets you the visual result you want using the existing theme, and then another that proposes the theme modification for RFC.

Let me know how you want to proceed.

[somatorio]

To make that change without the shortcode I would have to duplicate the kcd-porto logo, having it at the assets and a copy at static :/

Unless there is another way and @toshywoshy can point me towards it