docs: Updated the website to use the dark logo instead.

Author: chrisdutz

website/patches/header-content.patch

@@ -22,7 +22,7 @@
      <div class="navbar-brand">
 -      <a class="navbar-item" href="{{{or site.url siteRootPath}}}">{{site.title}}</a>
 +      <a class="navbar-item" href="{{{or site.url siteRootPath}}}">
-+          <img src="{{{or site.url siteRootPath}}}/plc4x/{{page.version}}/_images/apache_plc4x_logo_small.png" alt="Apache PLC4X">
++          <img src="{{{or site.url siteRootPath}}}/plc4x/{{page.version}}/_images/apache-plc4x-oakleaf-dark-small.png" alt="Apache PLC4X">
 +      </a>
        {{#if env.SITE_SEARCH_PROVIDER}}
        <div class="navbar-item search hide-for-print">

website/resources/images/apache-plc4x-oakleaf-dark-small.png

@@ -48,7 +48,7 @@
   <nav class="navbar">
     <div class="navbar-brand">
       <a class="navbar-item" href="./">
-          <img src="./plc4x/latest/_images/apache_plc4x_logo_small.png" alt="Apache PLC4X">
+          <img src="./plc4x/latest/_images/apache-plc4x-oakleaf-dark-small.png" alt="Apache PLC4X">
       </a>
       <div class="navbar-item search hide-for-print">
         <div id="search-field" class="field">
@@ -105,7 +105,7 @@
                             <div class="row margin-rl-0">
                                 <div class="col-md-12">
                                     <div class="margin-rl-auto">
-                                        <img src="images/apache_plc4x_logo.png" alt="Apache PLC4X"
+                                        <img src="images/apache-plc4x-oakleaf-dark.png" alt="Apache PLC4X"
                                              class="plc4x-logo center"/>
                                     </div>
                                     <h3 style="text-align:center;">