static: Remove unused files

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>

LICENSES

@@ -14,8 +14,6 @@ otherwise. Additional licenses are listed in debian/copyright.
 - data/etc/apache2/sites-available/plinth.conf :: -
 - data/etc/apache2/sites-available/plinth-ssl.conf :: -
 - data/etc/sudoers.d/plinth :: -
-- static/themes/default/readme.md :: [[file:themes/default/readme.md::This%20theme%20is%20free%20software%20offered%20to%20you%20under%20the%20terms%20of%20the%20GNU%20Affero%20General%20Public%20License,%20Version%203%20or%20later:][GNU Affero General Public License Version 3]]
-- static/themes/default/screenshot.png :: -
 - static/themes/default/icons/diaspora.png :: [[https://upload.wikimedia.org/wikipedia/commons/thumb/8/85//Deluge-Logo.svg/2000px-Deluge-Logo.svg.png][Publc Domain]]
 - static/themes/default/icons/ejabberd.png :: [[https://www.ejabberd.im/][GPL-2]]
 - static/themes/default/icons/jsxc.png :: -

static/themes/default/readme.md

@@ -1,14 +0,0 @@
-#  FreedomBox HTML5 Bootstrap Theme by Sean "Diggity" O'Brien (https://github.com/seandiggity/Plinth)
-
-## Summary:
-
-This theme is free software offered to you under the terms of the GNU Affero
-General Public License, Version 3 or later:
-http://www.gnu.org/licenses/agpl.html
-
-It is based upon Twitter's Bootstrap (http://twitter.github.com/bootstrap)
-Bootstrap is licensed under the Apache License v2.0. Icons from Bootstrap
-originate from Glyphicons Free, licensed under Creative Commons Attribution 3.0.
-
-Refer to the FreedomBox documentation for information about editing themes and
-templates.