Update site to comply with ASF privacy site checks

See https://whimsy.apache.org/site/project/accumulo

* Add link to ASF privacy policy in ASF links section of navigation
* Stop linking to external CDNs for our default page layout. Instead,
  copy the resources, so they are hosted by our site. We don't really
  need the integrity checks to verify the downloads from CDN sites
  anymore. It adds no security since we're hosting them on the same
  service that would provide the checksum (same security domain for
  users to trust), and removing them alleviates the browser from that
  unnecessary work.
* Standardize how resources are specified, so they are more consistent
  and easier to update, including converting the embedded `<script>`
  from `_includes/scripts.html`, which contained our own custom scripts
  for our site, into its own `.js` file.
* Include free web fonts from fontawesome project, so the css can link
  to the ones we're hosting (downloaded from
  https://fontawesome.com/download, specifically
  https://use.fontawesome.com/releases/v6.4.2/fontawesome-free-6.4.2-web.zip)

This fixes #420

_includes/nav.html

@@ -56,6 +56,7 @@
             <li><a class="dropdown-item" href="https://www.apache.org/security">Security <span class="fa-solid fa-up-right-from-square"></span></a></li>
             <li><a class="dropdown-item" href="https://www.apache.org/foundation/thanks">Thanks <span class="fa-solid fa-up-right-from-square"></span></a></li>
             <li><a class="dropdown-item" href="https://www.apache.org/foundation/policies/conduct">Code of Conduct <span class="fa-solid fa-up-right-from-square"></span></a></li>
+            <li><a class="dropdown-item" href="https://www.apache.org/foundation/policies/privacy.html">Privacy Policy<span class="fa-solid fa-up-right-from-square"></span></a></li>
             <li><a class="dropdown-item" href="https://www.apache.org/events/current-event.html">Current Event <span class="fa-solid fa-up-right-from-square"></span></a></li>
           </ul>
         </li>

_layouts/default.html

@@ -20,18 +20,19 @@
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-4bw+/aepP/YC94hEpVNVgiZdgIC5+VKNBQNGCHeKRQN+PtmoHDEXuppvnDJzQIu9" crossorigin="anonymous">
-<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.css" rel="stylesheet">
-<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/v/bs5/dt-1.13.6/datatables.min.css">
-<link href="{{ site.baseurl }}/css/accumulo.css" rel="stylesheet" type="text/css">
+
+<link rel="stylesheet" type="text/css" href="{{ site.baseurl }}/css/bootstrap/5.3.1/dist/css/bootstrap.min.css">
+<link rel="stylesheet" type="text/css" href="{{ site.baseurl }}/css/fontawesome/fontawesome/fontawesome-free-6.4.2-web/css/all.min.css">
+<link rel="stylesheet" type="text/css" href="{{ site.baseurl }}/css/datatables/bs5/dt-1.13.6/datatables.min.css">
+<link rel="stylesheet" type="text/css" href="{{ site.baseurl }}/css/accumulo.css">
 
 <title>{% if page.title_prefix %}{{ page.title_prefix | escape }}{% endif %}{% if page.title %}{{ page.title | escape }}{% else %}{{ site.title | escape }}{% endif %}</title>
 
-<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.0/jquery.min.js" integrity="sha256-2Pmvv0kuTBOenSvLm6bvfBSSHrUJ+3A7x6P5Ebd07/g=" crossorigin="anonymous"></script>
-<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-HwwvtgBNo3bZJJLYd8oVXjrBZt8cqVSpeBNS5n7C8IVInixGAoxmnlMuBnhbgrkm" crossorigin="anonymous"></script>
-<script type="text/javascript" src="https://cdn.datatables.net/v/bs5/dt-1.13.6/datatables.min.js"></script>
+<script type="text/javascript" src="{{ site.baseurl }}/js/jquery/3.7.0/jquery.min.js"></script>
+<script type="text/javascript" src="{{ site.baseurl }}/js/bootstrap/5.3.1/dist/js/bootstrap.bundle.min.js"></script>
+<script type="text/javascript" src="{{ site.baseurl }}/js/datatables/bs5/dt-1.13.6/datatables.min.js"></script>
 <script type="text/javascript" src="https://www.apachecon.com/event-images/snippet.js"></script>
-{% include scripts.html %}
+<script type="text/javascript" src="{{ site.baseurl }}/js/accumulo.js"></script>
 </head>
 <body style="padding-top: 100px">