// https://www.mediawiki.org/wiki/Manual:Hooks/SkinBuildSidebar
$wgHooks['SkinBuildSidebar'][] = function ( $skin, &$sidebar ) use ( $wikWiki ) {
    $sidebar['Wikibase'][] = [
        'text'  => 'New Item',
        'href'  => '/wiki/Special:NewItem',
    ];
    $sidebar['Wikibase'][] = [
        'text'  => 'New Property',
        'href'  => '/wiki/Special:NewProperty',
    ];
    if( $wikWiki->getSetting('wwExtEnableWikibaseLexeme') ) {
        $sidebar['Wikibase'][] = [
            'text'  => 'New Lexeme',
            'href'  => '/wiki/Special:NewLexeme',
        ];
    }
    $sidebar['Wikibase'][] = [
        'text'  => 'New Schema',
        'href'  => '/wiki/Special:NewEntitySchema',
    ];
    $sidebar['Wikibase'][] = [
        'text'  => 'Query Service',
        'href'  => '/query/',
    ];
    $sidebar['Wikibase'][] = [
        'text'  => 'Cradle',
        'href'  => '/tools/cradle/',
    ];
    $sidebar['Wikibase'][] = [
        'text'  => 'QuickStatements',
        'href'  => '/tools/quickstatements/',
    ];
};