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// Paste these lines into website's console (Win/Linux: Ctrl + Shift + I / Mac: Cmd + Alt + I)

if(!!window.React ||
   !!document.querySelector('[data-reactroot], [data-reactid]') ||
   Array.from(document.querySelectorAll('*')).some(e => e._reactRootContainer !== undefined || Object.keys(e).some(k => k.startsWith('__reactContainer')))
)
  console.log('React.js');

if(!!document.querySelector('script[id=__NEXT_DATA__]'))
  console.log('Next.js');

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function theme_preprocess_breadcrumb(&$variables) {
  if (($node = \Drupal::routeMatch()->getParameter('node')) && $variables['breadcrumb']) {
    $variables['breadcrumb'][] = [
      'text' => $node->getTitle() 
    ];
    $variables['#cache']['contexts'][] = 'url.path';
  }
}

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This is for HTML signatures (tested in Outlook 2010/2016)
You have to specify the size of the image in <img> tag. 

For example, a image of width 30px and height 30px: 
<img src="<url>" alt="text" width="30" height="30">

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# add this before all other rewrite rules in your .htaccess
# backup your Apache file(s) first to avoid breaking things
# BE SURE TO TEST AND RELOAD APACHE AFTER MAKING THIS EDIT

# allow Let's Encrypt to access it's challenge file without the rewrite rules screwing them up
RewriteEngine On
RewriteRule "^.well-known/acme-challenge" - [L]

# Now, run an error check and reload Apache
/usr/sbin/apachectl configtest && /etc/init.d/httpd reload