docs: use https for documentation links

Switch a handful of documentation/website links from http to https.

Signed-off-by: Preyas Sharma <preyas17@zohomail.in>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

README

@@ -3,7 +3,7 @@ Linux systems through cross-compilation.
 
 The documentation can be found in docs/manual. You can generate a text
 document with 'make manual-text' and read output/docs/manual/manual.text.
-Online documentation can be found at http://buildroot.org/docs.html
+Online documentation can be found at https://buildroot.org/docs.html
 
 To build and use the buildroot stuff, do the following:
 

docs/website/contribute.html

@@ -14,22 +14,22 @@
       <ul>
 	<li>Reproducing, analyzing and fixing bugs from our
 	  <a href="https://gitlab.com/buildroot.org/buildroot/-/issues">bug tracker</a></li>
-	<li>Analyzing and fixing <a href="http://autobuild.buildroot.org/">
+	<li>Analyzing and fixing <a href="https://autobuild.buildroot.org/">
 	    autobuild failures</a></li>
 	<li>Reviewing and testing patches sent by other developers. See the
-	  <a href="http://lists.buildroot.org/mailman/listinfo/buildroot">mailing list
+	  <a href="https://lists.buildroot.org/mailman/listinfo/buildroot">mailing list
 	  </a> or <a href="https://patchwork.ozlabs.org/project/buildroot/list/">
 	    patchwork</a>.</li>
 	<li>Working on items from the
-	  <a href="http://www.elinux.org/Buildroot#Todo_list">TODO list</a></li>
-	<li><a href="http://buildroot.org/manual.html#submitting-patches">Submitting
+	  <a href="https://www.elinux.org/Buildroot#Todo_list">TODO list</a></li>
+	<li><a href="https://buildroot.org/manual.html#submitting-patches">Submitting
 	  your own patches</a> through the
 	  <a href="http://lists.buildroot.org/mailman/listinfo/buildroot">mailing list
 	</a></li>
       </ul>
 
       <p>For more details on these topics, check out the
-	<a href="http://buildroot.org/manual.html#_contributing_to_buildroot">
+	<a href="https://buildroot.org/manual.html#_contributing_to_buildroot">
 	  Contributing to buildroot</a> chapter in the Buildroot manual. Thanks for your help!</p>
 
       <p>If you need any support yourself, have a look at <a href="./support.html">

docs/website/download.html

@@ -98,7 +98,7 @@
       </table>
 
       This and earlier releases (and their PGP signatures) can always be downloaded from
-      <a href="/downloads/">http://buildroot.net/downloads/</a>.
+      <a href="/downloads/">https://buildroot.org/downloads/</a>.
     </div>
   </div>
 
@@ -123,7 +123,7 @@
       </div><br>
 
       <p>If you are not already familiar with using Git, we recommend
-	you visit <a href="http://git-scm.org">the Git
+	you visit <a href="https://git-scm.org">the Git
 	website</a>.</p>
 
       <p>Once you've checked out a copy of the source tree, you can