License the docs under GFDLv1.3+

Add a copy of the GNU Free Documentation License version 1.3, and
license the Jami manuals and documentation under the terms of the
GNU Free Documentation License, Version 1.3 or any later version
published by the Free Software Foundation; with no Invariant Sections,
no Front-Cover Texts, and no Back-Cover Texts.

Also, use the GNU All-Permissive License for the Makefile, conf.py,
and _templates/footer.html files since these files are rather small
and/or trivial.

GitLab: #3
Change-Id: If9f37afd66b9f415a9a4ac31ac037b9727fbb2e4

Makefile

 # -*- mode: makefile; -*-
 # Copyright (C) 2022 Savoir-faire Linux Inc.
 #
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
+# Copying and distribution of this file, with or without modification,
+# are permitted in any medium without royalty provided the copyright
+# notice and this notice are preserved.  This file is offered as-is,
+# without any warranty.
 
 CMD  ?= sphinx-build
 OPTS ?=

_templates/footer.html

 {#
  Copyright (C) 2022 Savoir-faire Linux Inc.
 
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ Copying and distribution of this file, with or without modification,
+ are permitted in any medium without royalty provided the copyright
+ notice and this notice are preserved.  This file is offered as-is,
+ without any warranty.
 
 The main purpose of this file is to enable use of a custom format
 for the copyright statement in page footers, and is based on the
@@ -44,14 +36,18 @@ following notice:
 
 {% extends '!footer.html' %}
 {% block contentinfo %}
-<p>{%- if show_copyright %}
+{%- if show_copyright and pagename != 'fdl' %}
   {%- if hasdoc('copyright') %}
-    {%- trans path=pathto('copyright'), copyright=copyright|e %}<a href="{{ path }}">Copyright</a> &#169; {{ copyright }}.{% endtrans %}
+    {%- trans path=pathto('copyright'), copyright=copyright|e %}<p><a href="{{ path }}">Copyright</a> &#169; {{ copyright }}</p>{% endtrans %}
   {%- else %}
-    {%- trans copyright=copyright|e %}Copyright &#169; {{ copyright }}.{% endtrans %}
+    {%- trans copyright=copyright|e %}<p>Copyright &#169; {{ copyright }}</p>{% endtrans %}
   {%- endif %}
+  <p>Permission is granted to copy, distribute and/or modify this document
+  under the terms of the <a href="fdl.html">GNU Free Documentation License</a>,
+  Version 1.3 or any later version published by the Free Software Foundation;
+  with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.</p>
 {%- endif %}
-{%- if build_id and build_url %}
+<p>{%- if build_id and build_url %}
   <span class="build">
     {#- Translators: Build is a noun, not a verb -#}
     {%- trans %}Build{% endtrans -%}

conf.py

 # Copyright (C) 2022 Savoir-faire Linux Inc.
 #
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
+# Copying and distribution of this file, with or without modification,
+# are permitted in any medium without royalty provided the copyright
+# notice and this notice are preserved.  This file is offered as-is,
+# without any warranty.
 
 # for a full list of Sphinx configuration options, see:
 # https://www.sphinx-doc.org/en/master/usage/configuration.html