reorganized static files folder

added folders for js and css files, added bootstrap files to static
removed requirement for bootstrap python package (bootstrap now in static)

lineups/templates/lineups/lineup.html

@@ -42,7 +42,7 @@
             </div>
         </form>
     </div>
-    <script src="{% static 'Sortable.js' %}"></script>
+    <script src="{% static 'js/Sortable.js' %}"></script>
     <script id="sortable">
         function refresh_lineup_order (){
             var player_rows = document.getElementById('lineup').querySelectorAll('tr')