add trademark legal disclaimers

Signed-off-by: Jeff Epler <jepler@unpythonic.net>

_config.yml

@@ -2,6 +2,17 @@
 title: LinuxCNC
 email: emc-developers@lists.sourceforge.net
 description: "LinuxCNC: an open source CNC machine controller"
+legal: "\
+    <p>LINUX® is the registered trademark of Linus Torvalds in the U.S. and \
+    other countries.  The registered trademark Linux® is used pursuant \
+    to a sublicense from LMI, the exclusive licensee of Linus Torvalds, \
+    owner of the mark on a world-wide basis.</p> \
+\
+    <p>The LinuxCNC project is not affiliated with Debian.  Debian is a \
+    registered trademark owned by Software in the Public Interest, Inc.</p> \
+\
+    <p>The LinuxCNC project is not affiliated with UBUNTU.  UBUNTU is a \
+    registered trademark owned by Canonical Limited.</p>"
 baseurl: ""
 url: "http://linuxcnc.org"
 exclude: [ scripts, README.md ]

_includes/footer.html

@@ -56,6 +56,7 @@
       <p class="text">{{ site.description }}</p>
     </div>
 
+    <div class="legal">{{ site.legal }}</div>
   </div>
 
 </footer>

css/main.css

@@ -136,6 +136,14 @@ a:visited { color: #205caa; }
   color: #828282;
 }
 
+.site-footer .legal { clear: both; }
+
+.site-footer .legal p {
+  font-size: 9px;
+  letter-spacing: -.3px;
+  color: #828282;
+}
+
 .github-icon-svg,
 .twitter-icon-svg {
   display: inline-block;