hswaw/site: show PIT banner only during tax season

Change-Id: Ida4b9e3a1efca19b6570ea33d217850fd351964f
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1961
Reviewed-by: q3k <q3k@hackerspace.pl>

hswaw/site/templates/index.html

@@ -1,4 +1,5 @@
 {{ block "content" . }}
+        {{ if .IsTaxSeason }}
         <section class="gallery-wrapper" id="pit">
             <div class="img-wrapper">
                 <img src="/static/site/pit1.jpg" />
@@ -8,6 +9,7 @@
                 <li data-name="pit2"><a href="#">Instrukcja</a></li>
             </ul>
         </section>
+        {{ end }}
         <div class="about">
             <h2>Czym jest Warszawski Hackerspace?</h2>
             <p>

hswaw/site/views.go

@@ -6,6 +6,7 @@ import (
 	"html/template"
 	"net/http"
 	"strings"
+	"time"
 
 	"github.com/golang/glog"
 
@@ -72,9 +73,15 @@ func (s *service) handleIndex(w http.ResponseWriter, r *http.Request) {
 		"Events":   s.getEvents(),
 		"AtStatus": atStatus,
 		"AtError":  atError,
+		"IsTaxSeason": isTaxSeason(),
 	})
 }
 
+func isTaxSeason() bool {
+	today := time.Now()
+	return today.Month() >= time.January && today.Month() <= time.April
+}
+
 func (s *service) handleMerch(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()