Remove flowr (pre switch to justified-layout)

Signed-off-by: Chris Warrick <kwpolska@gmail.com>

CHANGES.txt

@@ -4,6 +4,7 @@ New in master
 Features
 --------
 
+* Replace ``flowr.js`` with ``justified-layout`` by Flickr
 * ``bootblog4`` is the new default theme (Issue #2964)
 * New ``bootstrap4`` and ``bootblog4`` themes (Issue #2964)
 * New Thai translation by Narumol Hankrotha and Jean Jordaan

docs/theming.rst

@@ -37,8 +37,8 @@ assets
     and ``fonts`` (Bootstrap).
 
     The included themes use `Bootstrap <https://getbootstrap.com/>`_,
-    `baguetteBox <https://feimosi.github.io/baguetteBox.js/>`_, `Flowr.js
-    <https://github.com/kalyan02/flowr-js>`_ and `Moment.js
+    `baguetteBox <https://feimosi.github.io/baguetteBox.js/>`_, `Justified Layout by Flickr
+    <http://flickr.github.io/justified-layout/>`_ and `Moment.js
     <https://momentjs.com/>`_, so they are in assets, along with CSS files for
     syntax highlighting, reStructuredText and Jupyter, as well as a minified
     copy of jQuery.
@@ -256,7 +256,8 @@ These are the templates that come with the included themes:
       + ``title``: The title of the image.
       + ``size``: A dict containing ``w`` and ``h``, the real size of the thumbnail.
 
-    * ``photo_array_json``: a JSON dump of photo_array, used in the bootstrap theme by flowr.js
+    * ``photo_array_json``: a JSON dump of photo_array, used by the
+      ``justified-layout`` script
 
 ``list.tmpl``
     Template used to display generic lists of links, which it gets in ``items``,