Move logo attribution to extrafooter

Super handy!

[skip ci]

Author: bskinn

doc/source/_templates/footer.html

@@ -5,6 +5,13 @@
 {{ super }}
 
 <br /><br />
+
+<p class="footer-license">
+  Logo and favicon adapted from freely-available image at
+  https://heypik.com/images/hand-drawn-cartoon-color-tourist-attraction-sphinx_8ZU4501.html
+  (retrieved July 2019; now defunct).
+</p>
+
 <p class="footer-license">
   <a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a>
   &nbsp;&nbsp;

doc/source/index.rst

@@ -103,15 +103,4 @@ The project source repository is on GitHub: `bskinn/sphobjinv
 Indices and Tables
 ------------------
 
-  * :ref:`genindex`
-
-  * :ref:`modindex`
-
-  * :ref:`search`
-
-
-.. raw:: html
-
-   <small><em>Logo adapted from freely-available image at
-   https://heypik.com/images/hand-drawn-cartoon-color-tourist-attraction-sphinx_8ZU4501.html
-   (retrieved July 2019; now defunct).</em></small>
+:ref:`genindex` --- :ref:`modindex` --- :ref:`search`