Add "boards" context processor

This adds the "boards" context data to all pages, so they can render the
boards nav page.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/urls.py

@@ -10,7 +10,7 @@ from board.views import *
 app_name = "board"
 urlpatterns = [
     # Index
-    path("", HomeView.as_view(), name="home"),
+    path("", TemplateView.as_view(template_name="board/home.html"), name="home"),
     # News views
     path("news/", NewsListView.as_view(), name="news_list"),
     # Rules views