Initial changes for 5.x

[malberts]

• Raised minimum MediaWiki version from 1.29 to 1.39
• Raised minimum PHP version from 5.6 to 8.0
• Add Bootstrap 5.3

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Current state:

• full SCSS compiles, but not tested visually
• JS is not loading correctly

[malberts]

Requires more work, but JS is now loadable with this snippet in LocalSettings.php:

$wgHooks['SetupAfterCache'][] = function(){
    \Bootstrap\BootstrapManager::getInstance()->addAllBootstrapModules();
    $GLOBALS[ 'wgResourceModules' ]['ext.bootstrap.scripts']['packageFiles'][] = [
        'name' => 'components.js',
        'content' => '
            require("./alert.js");
            require("./button.js");
            require("./carousel.js");
            require("./collapse.js");
            require("./dropdown.js");
            require("./modal.js");
            require("./offcanvas.js");
            require("./popover.js");
            require("./scrollspy.js");
            require("./tab.js");
            require("./toast.js");
            require("./tooltip.js");
        ',
        'main' => true
    ];
    return true;
};

$wgHooks['BeforePageDisplay'][]=function( OutputPage $out, Skin $skin ){
    $out->addModuleStyles( [ 'ext.bootstrap.styles' ] );
    $out->addModules( [ 'ext.bootstrap.scripts' ] );
    return true;
};

The additional require()s are necessary because ResourceLoader non-main packageFiles are available but not loaded, meaning no BS code is run automatically.

This is different when using bootstrap.bundle.js as the main packageFile. All the code is included in one file and this is run once loaded.