jekyll(assets): move bootstrap to assets folder

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

_includes/head.html

@@ -61,12 +61,12 @@
   <!-- landing page scripts -->
   <script defer src="/js/theme-switcher.js"></script>
   <script defer src="/js/jquery.js"></script>
-  <script defer src="/js/bootstrap.min.js"></script>
+  <script defer src="/assets/bootstrap/bootstrap.min.js"></script>
   {%- else -%}
   <script defer src="/js/theme-switcher.js"></script>
   <script defer src="/js/anchorlinks.js"></script>
   <script defer src="/js/jquery.js"></script>
-  <script defer src="/js/bootstrap.min.js"></script>
+  <script defer src="/assets/bootstrap/bootstrap.min.js"></script>
   <script defer src="/js/docs.js"></script>
   {%- endif -%}
   {%- if site.local_search -%}
@@ -88,7 +88,7 @@
   <link rel="preload" as="font" href="/fonts/glyphicons-halflings-regular.woff2"               type="font/woff2" crossorigin="anonymous">
 
   <link rel="stylesheet" href="/assets/fontawesome/css/all.min.css">
-  <link rel="stylesheet" href="/css/bootstrap.min.css">
+  <link rel="stylesheet" href="/assets/bootstrap/bootstrap.min.css">
   <link rel="stylesheet" href="/assets/css/style.css" id="pagestyle">
 
   <!-- SEO stuff -->