Wiki setup: Add logo to footer

[oldenbourglaura]

@mrchristian I want to add the Wikibase logo next to the "Powered by MediaWiki" logo in the footer.

Could you please:

• Upload the logo file to the wiki's /images/ folder on the server, just like the site logo
• For example this: https://www.wikimedia.de/wp-content/webp-express/webp-images/doc-root/wp-content/uploads/2019/10/wikibase-vertical_2x.png.webp (resized to 88×31px badge size)
• In LocalSettings.php, use the $wgFooterIcons setting:

$wgFooterIcons['poweredby']['wikibase'] = [
    'src' => "$wgResourceBasePath/images/wikibase-logo.png",
    'url' => 'https://wikiba.se',
    'alt' => 'Wikibase',
];

(Footer icons are grouped into sections. The built-in MediaWiki logo sits in poweredby — adding yours to the same group places it alongside the MediaWiki logo)

[mrchristian]

@oldenbourglaura - can you look at we add a second group of buttons for Partners: TIB and semanticClimate

Here is a TIB logo - other TIB logos can be found here https://wiki.tib.eu/confluence/spaces/oefftibub/pages/143495714/TIB-Logo