Update license used for the materials of this blog

All the contents are now under CC BY-NC-ND 4.0, that is much more strict
regarding reuse and commercial usage.

README.markdown

@@ -17,7 +17,7 @@ The installation of this blog can be done with the following steps.
     gem update --system
     gem install jekyll
 
-  3) Run server on http://0.0.0.0:4000
+  3) Run server on http://127.0.0.1:4000
 
     jekyll server
 
@@ -30,4 +30,4 @@ Content materials in content/materials are under the license provided on
 each document.
 
 Blog articles and pages are licensed under
-[CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/).
+[CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/).

_layouts/default.html

@@ -144,7 +144,7 @@ <h2>Sponsor</h2>
     Unless otherwise specified, the contents of <a href="/">this website</a>
     are (C)Copyright <a href="/about/">Michael Paquier</a> 2010-2024 and are
     licensed for use under
-    <a href="https://creativecommons.org/licenses/by-sa/3.0/">CC BY-SA 3.0</a>.
+    <a href=" https://creativecommons.org/licenses/by-nc-nd/4.0/">CC BY-NC-ND 4.0</a>.
   </p>
 </div>
 </body>