Bump some cache times up

About page goes from 10min to 30min (short cache to rotate the
quotes).

Search results go from 15min to 30 min.

Dynamic CSS goes from 6 hours to 48 hours, since we use cache busting
URLs everywhere these days, and on average they change very seldom.

pgweb/core/views.py

@@ -89,7 +89,7 @@ def home(request):
 
 
 # About page view (contains information about PostgreSQL + random quotes)
-@cache(minutes=10)
+@cache(minutes=30)
 def about(request):
     # get 5 random quotes
     quotes = Quote.objects.filter(approved=True).order_by('?').all()[:5]
@@ -212,7 +212,7 @@ _dynamic_cssmap = {
 }
 
 
-@cache(hours=6)
+@cache(hours=48)
 def dynamic_css(request, css):
     if css not in _dynamic_cssmap:
         raise Http404('CSS not found')

pgweb/search/views.py

@@ -47,7 +47,7 @@ def generate_pagelinks(pagenum, totalpages, querystring):
 
 
 @csrf_exempt
-@cache(minutes=15)
+@cache(minutes=30)
 def search(request):
     # Perform a general web search
     # Since this lives in a different database, we open a direct